Adjectives That Start With O

May 7, 2023

Whether you’re journaling, writing love letters, or working on your resume, you can describe many things in your life by using adjectives that start with O. Having the right vocabulary to express yourself can make all of the difference in the quality of your work!

Table of Contents

Common Adjectives That Start With O

Here are just a few O adjectives that you’ve probably seen before. You can use them for people, ideas, thoughts, dreams, goal charts, and more. Their flexibility is why they’re so popular!

Obsessive: To be obsessive is to think about something frequently or excessively. It doesn’t always have a positive connotation, but you can use it in positive contexts: “I have an obsessive interest in fitness!”
Ornamental: An ornamental object is a decorative one, often with extravagant details. Imagine an ornamental rug.
Official: Official technically means “coming from an authority,” but you can use it in more casual environments as a shorthand for real, formal, or important.
Ordinary: If something is ordinary, it’s common, regular, or not particularly noteworthy. Its opposite is “extraordinary” or something rare and special.
Offbeat: Do you walk to the beat of your own drum? You’re offbeat. It means different, eccentric, or unconventional.
Opaque: Literally meaning “not transparent” or “not letting light in,” opaque is also used figuratively to describe something difficult to understand.
Opportunistic: If someone is opportunistic, they’re eager to jump at chances or take advantage of opportunities.
Optic: Optic is related to eyes and vision. Another alternative is “optical.” Think about optic nerves, optic instruments, and optic lenses.
Open-air: Have you been invited to an open-air venue? It usually means “outdoor” in the sense of “not being covered by a roof,” but it’s also shorthand for big, open, and airy spaces in general.
Oversuspicious: You just know that someone is up to no good. However, if you take it too far, you’re oversuspicious of them.
Overcast: Overcast is a descriptive word that you’ll often find used in weather-related discussions. It means cloudy.
Outsize: Technically meaning any size outside the norm, outsize is most commonly understood to be overly large or heavy.
Organic: Organic has multiple definitions, but they all relate to natural things and processes. Think organic foods that aren’t made with artificial chemicals.
Overzealous: Enthusiasm is great, but too much of it, and you might become overzealous or excessively eager.
Optional: If something is optional, it isn’t mandatory or compulsory. You can choose whether or not to do it.

Positive Adjectives That Start With O

Are you trying to compliment someone? Are you writing mantras or affirmations? Maybe you want to add a little embellishment to your latest short story. Here are some positive, forward-thinking O adjectives to capture positive emotions, surroundings, situations, or people’s personalities.

Open-minded: Being open-minded is having your mind “open” or receptive to new ideas and beliefs. You can use it as an adjective to describe open-minded people, open-minded literature, and so on.
Optimistic: Do you always look on the bright side? You might be optimistic, believing that good or happy things are coming in the future.
Optimum: An optimum choice is the best choice. An optimum result is the best result. Basically, optimum means “top.”
Omnipotent: Omnipotent is defined as having unlimited authority or power. Think about an omnipotent ruler or deity.
Outstanding: Outstanding is a fun word you can flip backward to understand its meaning: standing out. When you’re awesome, above average, or better than the rest, you’re outstanding.
Obedient: To be obedient is to follow the rules or do what’s expected. Obedient children, for example, are every parent’s wish.
Okay: Okay can mean many things, including acceptable, suitable, and satisfactory. It can also convey that something is undamaged or unharmed.
Overjoyed: When you’re overjoyed, you’re absolutely thrilled. It’s a positive word that describes a feeling beyond “joy.”
Optimal: Optimal is a lot like optimum: the best possible version of something. In fact, they’re considered synonyms.
Original: To be original is to be fresh, novel, unique, or not something seen before. It can also mean “first” in a play on its root word “origin.”
Observant: An observant person is one who notices things. They’re keen-eyed or hawk-eyed to a situation and its details.
Open-hearted: If you’re open-hearted, your heart is “open” to new things. It’s a term commonly used to describe someone who is a warm, kind, friendly, or generous person.
Omniscient: One of the best personality adjectives that start with O that you can use is omniscient, someone with an unlimited understanding.
Omnipotent: If you need to describe a person with unlimited power or great power, you can use the O adjective omnipotent.