"primmest" in the adjective sense
1. mincing, niminy-piminy, prim, twee
affectedly dainty or refined
2. priggish, prim, prissy, prudish, puritanical, square-toed, straitlaced, strait-laced, straightlaced, straight-laced, tight-laced, victorian
exaggeratedly proper
"my straitlaced Aunt Anna doesn't approve of my miniskirts"
Source: WordNet® (An amazing lexical database of English)
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