THESAURUS
unassertive
abject, accepting, acquiescent, agreeable, assenting, backward, bashful, complaisant, compliable, compliant, complying, consenting, diffident, modest, nondissenting, nonresistant, nonresisting, nonresistive, obedient, passive, rabbity, resigned, retiring, self-effacing, servile, shy, submissive, subservient, supine, timid, unassured, uncomplaining, unresistant, unresisting