pantywaist

Adjective

 * 1)  Weak, timid, effeminate, ineffectual.
 * His rough, burly father was mortified by the lad's pantywaist behavior.

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.
 * 1)  An ineffectual, weak, or timid person, especially a boy or young man; a sissy.

Synonyms

 * ,, ; see also Thesaurus:milksop