Words Starting with O

Explore 85 words beginning with the letter O. Each entry includes definitions, pronunciations, and example sentences.

Obdurate

/ˈɒb.dʒʊ.ər.ɪt/

Stubbornly refusing to change one's opinion or course of action.

EN → ZH

Obfuscate

/ˈɒb.fə.skeɪt/

to deliberately make something unclear or difficult to understand

EN → ZH

Obfuscation

/ˌɒb.fəˈskeɪ.ʃən/

The action of making something obscure, unclear, or unintelligible.

EN → ZH

Objet D'art

/əʊbʒɛ ˈdɑːr/

an object made for artistic purposes

EN → ZH

Objurgate

/ˈɒb.dʒʌr.ɡeɪt/

to rebuke or scold fiercely; to criticize or reprimand sharply

EN → ZH

Oblique

/əˈbliːk/

Not explicit or done in a direct way; deviously achieved.

EN → ZH

Oblivion

/əˈblɪv.i.ən/

The state of being unaware or unconscious of what is happening around one.

EN → ZH

Oblivious

/əˈblɪviəs/

not aware of or concerned about what is happening around one

EN → ZH

Oblong

/ˈɒblɒŋ/

Having an elongated shape; longer than it is wide.

EN → ZH

Obloquy

/ˈɒbləkwɪ/

Strong public criticism or verbal abuse.

EN → ZH

Obscurantist

/əbˈskjʊəːr(ə)ntɪst/

A person who opposes the spread of knowledge or enlightenment, often by promoting ignorance or obscu...

EN → ZH

Obsequious

/əbˈsiː.kwi.əs/

Showing too great a willingness to serve or please someone; excessively fawning or flattering.

EN → ZH

Obsequiousness

/əbˈsiːkwɪəsnɪs/

the quality of being obsequious; excessive eagerness to please or obey.

EN → ZH

Obsequy

/ˈɒbsɪkwɪ/

A funeral rite or ceremony, especially a formal one.

EN → ZH

Obsolescence

/ˌɒb.səˈlɛs.əns/

The process of becoming obsolete or outdated and no longer used.

EN → ZH

Obstinacy

/ˈɒb.stɪ.nə.si/

The quality of being obstinate; stubbornness.

EN → ZH

Obstinate

/ˈɒbstɪnət/

stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade...

EN → ZH

Obstreperous

/əbˈstrɛp.ər.əs/

noisy and difficult to control

EN → ZH

Obtain

/əbˈteɪn/

To acquire or get something, usually by effort or request.

EN → ZH

Obtuse

/əbˈtjuːs/

Not sharp or pointed; blunt.

EN → ZH

Obviate

/ˈɒbvɪeɪt/

To remove a need or difficulty; to prevent something from happening.

EN → ZH

Occasional

/əˈkeɪʒənəl/

Occurring, appearing, or done infrequently and irregularly.

EN → ZH

Occlude

/əˈkluːd/

to stop, close up, or obstruct something

EN → ZH

Occluded

/əˈkluːdɪd/

Blocked or obstructed, particularly in terms of visibility or light.

EN → ZH

Occlusion

/əˈkluːʒən/

The act of occluding or the state of being occluded; blockage or closure of a passage or opening.

EN → ZH

Occult

/əˈkʌlt/

Relating to mystical, supernatural, or magical powers, practices, or phenomena.

EN → ZH

Occur

/əˈkɜr/

to happen or take place; to come into being or existence.

EN → ZH

Oceanography

/əʊʃəˈnɒɡrəfi/

The branch of science that deals with the physical and biological properties and phenomena of the se...

EN → ZH

Ochoa

oʊˈtʃoʊə

Ochoa is a surname of Spanish origin, often found in Spanish-speaking countries and communities.

EN → ZH

Octogenarian

/ˌɒktəʊdʒɪˈnɛəriən/

A person who is between 80 and 89 years old.

EN → ZH

Odious

/ˈoʊ.dɪ.əs/

extremely unpleasant or repulsive; deserving of hatred.

EN → ZH

Odium

/ˈoʊ.di.əm/

General or widespread hatred or disgust incurred by someone as a result of their actions.

EN → ZH

Odyssey

/ˈɒd.ɪ.si/

A long and eventful journey or experience.

EN → ZH

Of

Used to indicate belonging or possession.

EN → ZH

Officious

/əˈfɪʃəs/

assertive of authority in an annoyingly domineering way, especially with regard to petty or trivial ...

EN → ZH

Offing

/ˈɔːfɪŋ/

the distant part of the sea seen from the shore; the part of the sea that is not close to the land.

EN → ZH

Ok

/oʊˈkeɪ/

satisfactory but not exceptionally good

EN → ZH

Oleaginous

/ˌoʊliˈædʒɪnəs/

rich in, covered with, or resembling oil; having a smooth or greasy texture; excessively flattering ...

EN → ZH

Oligarchy

/ˈɒl.ɪ.ɡɑː.ki/

A form of power structure in which power resides in the hands of a small number of people.

EN → ZH

Ombudsman

/ˈɒmbʌdz.mən/

An official appointed to investigate individuals' complaints against a company or organization, espe...

EN → ZH

Omnifarious

/ˌɒmnɪˈfɛərɪəs/

comprising or relating to all varieties

EN → ZH

Omnipotent

/ɑːmˈnɪpətənt/

having unlimited power; able to do anything.

EN → ZH

Omnipresent

/ˌɒmnɪˈprɛzənt/

Present everywhere at the same time.

EN → ZH

Omniscience

/ɑːmˈnɪʃəns/

The state of knowing everything; having unlimited knowledge.

EN → ZH

Omniscient

/əmˈnɪʃ.ənt/

having complete or unlimited knowledge, awareness, or understanding; perceiving all things.

EN → ZH

Omnishambles

/ˈɒmnɪˌʃæmbəlz/

A situation that has been comprehensively mismanaged, characterized by a string of blunders and misc...

EN → ZH

Omphalos

/ˈɒm.fə.lɒs/

a central point; a navel or umbilicus; in ancient cultures, a religious center or a symbolic locatio...

EN → ZH

Omphaloskepsis

/ˌɒmfəloʊˈskɛp.sɪs/

the act of contemplating one's navel as an exercise in meditation or self-reflection

EN → ZH

Ondoyant

/ɔ̃.dwa.jɑ̃/

undulating; having a wavy form or surface.

EN → ZH

Oniric

/əˈnaɪrɪk/

relating to dreams or dreaming

EN → ZH

Onomatology

/ˌɒnəˈmætələdʒi/

The study of proper names and their meanings, origins, and uses.

EN → ZH

Onomatopoeia

/ˌɒnəˌmætəˈpiːə/

The formation of a word from a sound associated with what is named.

EN → ZH

Ontogeny

/ɒnˈtɒdʒəni/

The development of an individual organism from the embryo to its mature form.

EN → ZH

Ontological

/ˌɒn.təˈlɒɡ.ɪ.kəl/

Relating to the branch of metaphysics dealing with the nature of being.

EN → ZH

Opalescence

/ˌoʊ.pəˈlɛs.əns/

The characteristic of displaying a play of colors like that of an opal.

EN → ZH

Opalescent

/ˌoʊ.pəˈlɛs.ənt/

Exhibiting a play of colors like that of an opal; having a milky iridescence.

EN → ZH

Opaque

/oʊˈpeɪk/

Not able to be seen through; not transparent.

EN → ZH

Ophidian

/əˈfɪd.i.ən/

of or relating to snakes

EN → ZH

Opine

/əˈpaɪn/

to express an opinion or viewpoint

EN → ZH

Opistimology

ˌɒpɪstəˈmɒlədʒi

The study of knowledge, including its nature, origin, and limits.

EN → ZH

Opium

ˈoʊ.pi.əm

A narcotic drug obtained from the juice of the opium poppy, used for pain relief and as a sedative.

EN → ZH

Opportunity

/ˌɒp.əˈtjuː.nɪ.ti/

A set of circumstances that makes it possible to do something.

EN → ZH

Opprobrium

/əˈprəʊ.bri.əm/

Harsh criticism or censure.

EN → ZH

Oppugn

/əˈpjuːn/

To call into question; to oppose or contest; to challenge.

EN → ZH

Opulence

/ˈɒpjʊləns/

Great wealth or luxuriousness.

EN → ZH

Opulent

/ˈɒpjʊlənt/

characterized by rich abundance, lavishness, and luxuriousness; indicative of wealth and affluence.

EN → ZH

Oracular

/əˈræk.jə.lər/

Relating to an oracle or prophecy; giving prophetic messages or predictions.

EN → ZH

Oratory

/ˈɔːrəˌtɔːri/

the art of public speaking, especially in a formal or rhetorical manner

EN → ZH

Organelle

ɔrˈɡænˌɛl

A specialized subunit within a cell that has a specific function, surrounded by a membrane.

EN → ZH

Orison

/ˈɔːrɪzən/

A prayer or plea to God.

EN → ZH

Orotund

/ˈɔːrəˌtʌnd/

Characterized by a full, rounded sound; rich and sonorous.

EN → ZH

Orphean

/ɔːrˈfiːən/

Relating to or characteristic of Orpheus, often associated with themes of loss and longing in art an...

EN → ZH

Orthogonal

/ɔːrˈθɒɡənl/

Relating to lines or planes that are at right angles to each other.

EN → ZH

Oscillate

/ˈɒsɪleɪt/

to move or swing back and forth in a regular rhythm

EN → ZH

Oscillation

/ˌɒsɪˈleɪʃən/

the action of oscillating; movement back and forth at a regular speed.

EN → ZH

Ossify

/ˈɒs.ɪ.faɪ/

to turn into bone; to become rigid or inflexible in behavior or ideas

EN → ZH

Ostentatious

/ˌɒstənˈteɪʃəs/

characterized by vulgar or pretentious display; designed to impress or attract notice.

EN → ZH

Ostracism

/ˈɒstrəsɪzəm/

Exclusion from a society or group.

EN → ZH

Ostracize

/ˈɒstrəsaɪz/

To exclude someone from a group or society.

EN → ZH

Othransis

ˈoʊθræn.sɪs

The accidental utterance of unwanted or inappropriate thoughts, often revealing inner feelings or op...

EN → ZH

Outcome

/ˈaʊt.kʌm/

The result or consequence of an action, event, or situation.

EN → ZH

Overweening

/ˌoʊvərˈwiːnɪŋ/

Excessively proud of oneself; arrogant; presumptuously confident.

EN → ZH

Overwrought

/ˌoʊvərˈrɔt/

In a state of nervous excitement or anxiety; excessively agitated or distraught.

EN → ZH

Oxymoron

/ˌɒksɪˈmɔːrɒn/

a figure of speech in which contradictory terms appear in conjunction

EN → ZH

Oxymoronic

/ˌɒksɪˈmɔːrɪk/

characterized by a combination of contradictory or incongruent words or ideas

EN → ZH