- infrequent (adj.)
[infrequent 词源字典]
- 1530s, from Latin infrequentem (nominative infrequens) "occurring seldom, unusual; not crowded, absent," from in- "not" (see in- (1)) + frequens (see frequent). Related: Infrequently.[infrequent etymology, infrequent origin, 英语词源]