meek.

afraid, ambivalent, apprehensive, capricious, cowering, coy, demure, diffident, faint-hearted, fearful, feeble, frightened, gentle, humble, intimidated, irresolute, mild, modest, mousy, nervous, pusillanimous, rabbity, retiring, shaky, shrinking, shy, soft, spineless, spiritless, submissive, timid, timorous, trembling, unassertive, unassured, unnerved, vacillating, wavering....