Entry Word: informal

Function: adjective

Meaning: 1 not rigidly following established form, custom, or rules <an informal meeting allowed everyone to get acquainted>

Synonyms irregular, unceremonious, unconventional, unorthodox

Related Words unauthorized, unofficial; casual, easygoing, lax, loose, relaxed

Near Antonyms correct, decorous, proper; constrained, inhibited, restrained, rigid, stiff, stuffy, uptight

Antonyms ceremonial, ceremonious, conventional, formal, orthodox, regular, routine

2 not designed for special occasions <chose an informal flowery dress> — see casual 1
3 used in or suitable for speech and not formal writing <please donʼt use informal language in a serious essay> — see colloquial 1