adj.
(primmer, primmest)
feeling or showing disapproval of anything improper; stiffly correct.
v.
(prims, primming, primmed)
purse (the mouth or lips) into a prim expression.
Derivative
Etymology
C17 (as v.): prob. ult. from OFr. prin, Provençal prim ‘excellent, delicate’, from L. primus ‘first’.