pantywaist
adjective
°(informal dated especially of a male person) Weak, timid, effeminate, ineffectual.
"His rough, burly father was mortified by the lad's pantywaist behavior."
noun
°(informal dated) A children's undergarment composed, in part, of panties attached to a waistband.
°(pejorative dated) An ineffectual, weak, or timid person, especially a boy or young man; a sissy.