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informal (adj.)

mid-15c., "lacking form; not in accordance with the rules of formal logic," from in- (1) "not, opposite of" + formal (adj.). Meaning "irregular, unofficial, not according to rule or custom" is from c. 1600. Sense of "done without ceremony" is from 1828. Related: Informally.

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Definitions of informal from WordNet

informal (adj.)
not formal;
an informal gathering of friends
an informal free-and-easy manner
conservative people unaccustomed to informal dress
informal (adj.)
not officially recognized or controlled;
an informal agreement
Synonyms: loose
informal (adj.)
used of spoken and written language;
informal (adj.)
having or fostering a warm or friendly and informal atmosphere;
a relaxed informal manner
Synonyms: cozy / intimate
From wordnet.princeton.edu