Whether you’re playing a word-guessing game or studying new English words, the complete list of adjectives starting with an O below will be of great help. We’ve categorized them into different nuances so you can absorb their meaning better. Scroll down to learn more!

In This Article:

Positive Adjectives That Begin With The Letter O

These positive adjectives will add a welcomed embellishment to your compliments or affirmations, highlighting the positive vibe and emotion in your statement.

Adjectives	Meaning
Obligating	Willing to help or please others.
One-of-a-kind	Unique and special, unlike any other.
Open-hearted	Kind, generous, and willing to share emotions.
On-point	Highly precise
Outstanding	Exceptionally good; excellent.
Obedient	Willing to comply with orders or requests.
Optimal	Best or most effective; ideal.
Observant	Quick to notice or perceive things.
Overjoyed	Extremely happy or delighted.
Outspoken	Frank and unreserved in speech.
Opulent	Rich and luxurious.
Ornate	Highly decorated and elaborate.
Out-of-this-world	Extremely impressive or excellent.
Otherworldly	Relating to another realm; mystical or strange.
Original	Fresh and unique in style or idea.
Orderly	Neatly and methodically arranged.
Okay	Acceptable or satisfactory.
Oomph-like	Dynamic, full of enthusiasm and energy.
Obtainable	Able to be acquired or achieved.
Omnipotent	Having unlimited power and authority.

Negative Adjectives Starting In O

Negativity always goes hand in hand with positivity. Sometimes, we need to articulate our negative feelings towards something undesirable or unpleasant, and these adjectives will be powerful tools.

Adjectives	Meaning
Objectionable	Offensive; causing disapproval.
Oblivious	Unaware or forgetful of something.
Obligational	Relating to a duty or commitment.
Obsessed	Excessively preoccupied with something.
Obscure	Not well-known; unclear or hard to understand.
Obsolete	Outdated; no longer in use.
Off-beat	Unconventional; unusual.
Obnoxious	Highly offensive or annoying.
Odious	Extremely unpleasant or repulsive.
Offensive	Causing someone to feel hurt or upset.
Overbearing	Domineering; trying to control others.
Overloaded	Burdened with too much to handle.
Opinionated	Holding strong beliefs; often unwilling to consider others’ views.
Outdated	Old-fashioned; no longer current.
Outlaw	Living outside the law; criminal.
Overcast	Cloudy or gloomy.
Overwhelmed	Feeling overpowered; unable to cope.
Outrageous	Shockingly bad or excessive.
Onerous	Involving a lot of effort and difficulty.
Ominous	Giving the impression that something bad is going to happen.

O Words To Describe Someone

Each person has their own set of traits and characteristics. If you’re struggling to capture someone’s unique personality with words, take a look at the table below to see if anything lights the bulb.

Adjectives	Meaning
Oafish	Clumsy or unintelligent.
Optimistic	Hopeful and confident about the future.
Obeisant	Showing respect or obedience.
Obese	Extremely overweight.
Objectionable	Offensive or unpleasant.
Obligated	Required to do something by law or duty.
Obscene	Offensive to moral principles; indecent.
Obstructive	Causing a blockage or hindrance.
Odd	Unusual or strange.
Occupied	Busy and active
Old	Having lived for a long time; not new.
Old-school	Traditional; not modern.
Ordinary	Normal; not special or unique.
Outgoing	Friendly and sociable; enjoys meeting people.
Overweight	Weighing more than is healthy or normal.
Overzealous	Excessively enthusiastic or eager.
On-task	Focused and diligent in completing tasks.
Overconfident	Excessively confident; having too much confidence.
Ornery	Bad-tempered and combative; stubborn.
Orphaned	Having lost both parents or not having any parents.

Funny Adjectives That Start With An O

Running into something whimsical and funny that cracks you up? Let’s play the role of a comedian and describe it with these adjectives that begin with O! You might tickle others’ funny bones as well!

Adjectives	Meaning
Obfuscatory	Intended to confuse or obscure.
Obtuse	Lacking sharpness or quickness of intellect; insensitive.
Oblong	Having an elongated shape, longer than it is wide.
Octopean	Relating to or resembling an octopus.
Octopine	Related to or resembling an octopus.
Odd-looking	Unusual or strange in appearance.
Ohmic	Relating to electrical resistance or Ohm’s law.
Oozy	Slimy or sticky; leaking or exuding moisture.
Outlandish	Extremely unusual or bizarre.
Oxymoronic	Containing contradictory or opposite elements.
Overblown	Excessively inflated or exaggerated.
Ostentatious	Showy; designed to impress or attract notice.
Oddball	Unconventional or eccentric; unusual.
Obstreperous	Noisy and difficult to control.
Off-kilter	Unbalanced or unconventional; not quite right.

Cute Adjectives Starting From O

A few adjectives that start with O describe how adorable someone or something is. If you’re stuck with words, let us give you a hand with a comprehensive list below:

Adjectives	Meaning
Oak	Made of or relating to oak wood or the oak tree.
Objectional	Worthy of objection; disagreeable or offensive.
Oceangoing	Designed for travel across the ocean.
Ocellar	Relating to small, simple eyes, like those in some insects.
Ochreous	Having a yellowish-brown color, resembling ochre.
Ogival	Shaped like a pointed arch or a Gothic window.
Ole	An exclamation used to express approval or encouragement.
Octahedral	Having eight faces, typically referring to a geometric shape.
Octagonal	Having eight sides or angles.
Olive	Of a yellowish-green color, resembling olives.
Orchestral	Relating to an orchestra or orchestral music.
Ornamental	Decorative; serving to beautify or embellish.
Oscine	Relating to songbirds.
Oval	Having an elongated, rounded shape; egg-shaped.
Operatic	Relating to or characteristic of opera.
Olympic	Relating to the Olympic Games; exceptionally high-level.
Octonary	Relating to or consisting of eight parts.
Onyx	Made of or resembling the mineral onyx; typically black or banded.
Organic	Derived from living matter; natural.
Opalescent	Showing varying colors as an opal does; iridescent.

Other Common Adjectives Beginning With O

There are thousands of adjectives starting with O, and below are some common words with neutral meanings.

Adjectives	Meaning
Official	Relating to an authority or public body; formal and authorized.
Occasional	Happening or appearing at irregular intervals; infrequent.
Obvious	Easily perceived or understood; clear and apparent.
Oily	Containing or covered with oil; greasy.
Opaque	Not transparent or translucent; not allowing light to pass through.
Opposite	Completely different; situated across from something else.
On-time	Punctual; occurring at the scheduled time.
Optic	Relating to the eyes or vision.
Open-air	Located outside; not enclosed.
Outsize	Much larger than usual; oversized.
Optional	Available to be chosen but not obligatory.
Opportunistic	Taking immediate advantage, often unethically, of any circumstance of possible benefit.
Operable	Capable of being operated or functioning.
Omnivorous	Eating both plant and animal substances.
Oral	Relating to the mouth; spoken rather than written.
Orange	Having the color of the fruit orange; a bright reddish-yellow color.
Odorous	Having a strong or distinctive smell, often unpleasant.
Oversuspicious	Excessively inclined to suspect or mistrust.
Outdoor	Situated or used outside; in the open air.
Oncoming	Approaching; coming nearer in time or space.

See more:

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Conclusion

The list of adjectives that start with an O goes on. It’s best to jot down any new words you encounter during learning to ingrain them into your long-term memory. We advise you to put those words in sentences to better understand their usage. Good luck!