Synonyms of informal in English:

informal


See definition of informal

adjective

1‘an informal discussion’

SYNONYMS

casual, relaxed, easy-going, natural, unceremonious, unofficial, non-formal, unstudied, unaffected

open, friendly, intimate

simple, unpretentious, easy

informal unstuffy, unbuttoned, chummy, pally, matey

ANTONYMS

formal, official

2‘an informal speech style’

SYNONYMS

colloquial, vernacular, idiomatic, demotic, non-standard, popular, dialectal, non-literary

simple, natural, familiar, everyday, unofficial, unpretentious

informal slangy, chatty, folksy

ANTONYMS

formal, literary

3‘the guys wore very informal clothes’

SYNONYMS

casual, relaxed, comfortable, everyday, sloppy, leisure

sportif

informal comfy, laid-back, sporty

ANTONYMS

formal, smart

4‘an informal job sector has developed’

SYNONYMS

unofficial, irregular, grey, black, back-door, illegal, illicit