1. (adj) informal
not formal
Synonyms: cozy, loose, intimate
Antonyms: black-tie, semiformal, buckram, formal, titular, literary, ceremonial, pro forma, dress, full-dress, semi-formal, official, starchy, ceremonious, prescribed, unfriendly, nominal, conventional, perfunctory, white-tie, positive, form-only(a), stiff
2. (adj) informal, loose
not officially recognized or controlled
Synonyms: idle, loose, sluttish, informal, easy, wanton, cozy, escaped, liberal, free, open, lax, intimate, unaffixed, on the loose(p), light, slack, promiscuous, at large(p)
Antonyms: positive, semiformal, buckram, full-dress, ceremonious, starchy, form-only(a), formal, white-tie, titular, unfriendly, conventional, semi-formal, literary, ceremonial, dress, prescribed, perfunctory, official, black-tie, nominal, stiff, pro forma
3. (adj) informal
used of spoken and written language
Synonyms: cozy, loose, intimate
Antonyms: form-only(a), ceremonial, official, pro forma, buckram, unfriendly, conventional, prescribed, stiff, dress, formal, white-tie, semiformal, literary, nominal, ceremonious, starchy, full-dress, positive, perfunctory, black-tie, titular, semi-formal
4. (adj) cozy, intimate, informal
having or fostering a warm or friendly and informal atmosphere
Synonyms: internal, familiar, knowledgeable, cozy, loose, informal, intimate, versed, cosy, sexual, inner, snug
Antonyms: conventional, black-tie, starchy, buckram, nominal, pro forma, formal, official, perfunctory, semiformal, ceremonial, positive, unfriendly, ceremonious, form-only(a), white-tie, literary, titular, full-dress, prescribed, stiff, dress, semi-formal
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Synonyms for informal 
