puerile
Concise Oxford English Dictionary © 2008 Oxford University Press:
puerile /ˈpjʊərʌɪl/
▶adjective childishly silly and trivial.
– derivatives
puerilely adverb,
puerility /pjʊəˈrɪlɪti/ noun (pl. puerilities).
puerilely adverb,
puerility /pjʊəˈrɪlɪti/ noun (pl. puerilities).
– origin C16 (in the sense ‘like a boy’): from Fr. puéril or L. puerilis, from puer ‘boy’.
'puerile' also found in these Oxford entries:
