Meaning of INFORMAL in English

INFORMAL

■ adjective

1》 relaxed and unofficial; not formal.

2》 of or denoting the grammatical structures, vocabulary, and idiom suitable to everyday language and conversation rather than to official or formal contexts.

Derivatives

~ity noun

~ly adverb

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.