The story
- Latin · derived frompuerīlitās
- Middle French · derived frompuérilité
- Middle English · inherited frompuerilite
- English todaypuerility
From Middle English puerilite, from Middle French puérilité and its etymon Latin puerīlitās, from puerīlis (“childish, juvenile”), from puer (“boy”). By surface analysis, puerile + -ity.
Etymology from Wiktionary, CC BY-SA 4.0.