Milquetoast

Adjective

 * 1) Meek, timid.

Noun

 * 1)  A person of meek or timid disposition.

Thesaurus
baby, big baby, chicken, chicken liver, coward, crybaby, doormat, dull tool, fence-sitter, fraid-cat, fraidy-cat, funk, funker, gutless wonder, invertebrate, jellyfish, lightweight, lily liver, meek soul, milksop, mollycoddle, mouse, mugwump, namby-pamby, nebbish, nonentity, pansy, pantywaist, pushover, sad sack, scaredy-cat, shilly-shally, sissy, softling, softy, sop, waverer, weak sister, weakling, white feather, white liver, wobbler

Etymology
From the character Caspar Milquetoast of the comic strip The Timid Soul, created by Harold Webster and first published in 1924 (named after the American dish milk toast:).

Derived terms

 * milquetoasty