v. & adj.
v.tr. 1 make (efforts) ineffective. 2 prevent (a person) from achieving a purpose. 3 (as frustrated adj.) a discontented because unable to achieve one's desire. b sexually unfulfilled. 4 disappoint (a hope).
adj. archaic frustrated. frustratedly adv. frustrater n. frustrating adj. frustratingly adv. frustration n.
[ ME f. L frustrari frustrat- f. frustra in vain ]