Adjective
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having or fostering a warm or friendly and informal atmosphere
"had a cozy chat"
"a relaxed informal manner"
"an intimate cocktail lounge"
"the small room was cozy and intimate"
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used of spoken and written language
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not officially recognized or controlled
"an informal agreement"
"a loose organization of the local farmers"
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not formal
"conservative people unaccustomed to informal dress"
"an informal free-and-easy manner"
"an informal gathering of friends"