informal

The definition of informal is something or someone who is casual or relaxed.

(adjective)

An example of informal used as an adjective is informal clothing, such as comfy casual jeans and a sweatshirt.

See informal in Webster's New World College Dictionary

adjective

not formal; specif.,: the label [Informal] is used throughout this dictionary in this sense

not according to prescribed or fixed customs, rules, ceremonies, etc.
casual, easy, unceremonious, or relaxed
designed for use or wear on everyday occasions
not requiring formal dress
designating or of the words, phrases, and idioms characteristic of speech or writing that is casual, ordinary, unceremonious, etc.; colloquial

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See informal in American Heritage Dictionary 4

adjective

Not formal or ceremonious; casual: an informal gathering of friends; a relaxed, informal manner.
Not being in accord with prescribed regulations or forms; unofficial: an informal agreement.
Suited for everyday wear or use: informal clothes.
Being more appropriate for use in the spoken language than in the written language.

Related Forms: