Adjective > Casual

1 always used before a noun : happening by chance : not planned or expected

a casual encounter on the sidewalk

2 (more casual; most casual) : designed for or permitting ordinary dress, behavior, etc. : not formal

casual clothes

a casual restaurant

The atmosphere at the meeting was quite casual.

Note: Casual days are days (such as casual Fridays) when a company allows workers to dress in casual clothes.

3 a (more casual; most casual) : done without much thought, effort, or concern

She takes a casual (=nonchalant) approach to her homework.

He made a casual remark about her shoes.

3 b (more casual; most casual) : not involving a close or serious relationship

They are only casual acquaintances. (=they know each other but not very well)

Their relationship was casual.

3 c (more casual; most casual) : having some interest but not a lot : not serious

He’s a casual sports fan.

4 : happening at certain times but not on a regular basis

She found only casual work.

casually adjective

I looked casually down at my watch

He was dressed casually in jeans and a sweatshirt.

casualness noun (noncount)