noun

1. An undergarment composed, in part, of panties attached to a waistband.

2. An ineffectual, weak, or timid person, especially a boy or young man; a sissy.

Synonyms: nestle-cock, softy, wuss

adjective

1. (especially of a male person) Weak, timid, effeminate, ineffectual.

   “His rough, burly father was mortified by the lad's pantywaist behavior.”