1 not of a formal, official, or stiffly conventional nature
an informal luncheon
2 appropriate to everyday life or use
3 denoting or characterized by idiom, vocabulary, etc., appropriate to everyday conversational language rather than to formal written language
4 denoting a second-person pronoun in some languages used when the addressee is regarded as a friend or social inferior In French the pronoun ``tu'' is informal, while ``vous'' is formal
n (S. African)
euphemistic a squatter camp
n (Austral. and N.Z) an invalid vote or ballot
English Collins Dictionary - English Definition & Thesaurus
casual, colloquial, cosy, easy, familiar, natural, relaxed, simple, unceremonious, unconstrained, unofficial
ceremonious, constrained, conventional, formal, official, stiff
English Collins Dictionary - English synonyms & Thesaurus
Example: Her informal demeanor at the galla struck everyone as irresponsible.
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