(a.) Having a weak mind, either naturally or by reason of disease; feebleminded; foolish; idiotic.

abulic afeared aghast anxious apologetic apprehensive averse backward cautious chary chicken chickenhearted coward cowardly cowed craven daunted dismayed edgy faint fainthearted fear-struck feared fearful feeble feebleminded frail frightened fritter funking funky haunted with fear henhearted hesitant indisposed infirm intimidated invertebrate jittery jumpy lily-livered loath milk-livered milksoppish milksoppy mousy nervous on edge overtimid overtimorous panic-prone panic-stricken panicky pigeonhearted pliable pusillanimous rabbity regretful reluctant rueful scared scared to death scary shrinking shy sissified sissy skittish soft sorry spineless spooked terrified timid timorous uneager unhappy unmanly unmanned unwilling wary weak weak-kneed weak-minded weak-willed weakhearted white-livered yellow