Synonyms of 'diffident'

bashful, cautious, cowardly, Coy, demure, deprecative, deprecatory, fearful, fearsome, goosy, hesitant, jumpy, modest, mousy, nervous, qualmish, reluctant, retiring, scary, scrupulous, self-deprecating, self-effacing, shaky, shivery, shy, skittish, squeamish, tentative, timid, timorous, tremulous, trigger-happy, unassertive