/ prɪm; NAmE / adjective ( prim·mer , prim·mest ) ( disapproving )
1.
( of a person ) always behaving in a careful and formal way, and easily shocked by anything that is rude :
You can't tell her that joke—she's much too prim and proper .
2.
formal and neat
SYN demure :
a prim suit with a high-necked collar
► prim·ly adverb :
'You're not supposed to say that,' she said primly.
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WORD ORIGIN
late 17th cent. (as a verb): probably ultimately from Old French prin , Provençal prim excellent, delicate, from Latin primus first.