adjective
quiet and self-conscious
Synonyms: afraid, apprehensive, averse, backward, bashful, cautious, chary, circumspect, conscious, coy, demure, diffident, disinclined, distrustful, fearful, hesitant, humble, indisposed, introvert, introverted, loath, loner, modest, nervous, recessive, reluctant, reserved, reticent, retiring, self-effacing, shamefaced, sheepish, shrinking, skittish, suspicious, timid, unassertive, unassured, uneager, uneffusive, unresponsive, unsocial, unwilling, wary
Antonyms: confident, extroverted, unashamed, unreserved, unshy
adjective
lacking, failing
Synonyms: deficient, inadequate, insufficient, scant, scanty, scarce, short, unsufficient, wanting
Antonyms: adequate, enough, sufficient