frustrate

Synonyms: annul arrest baffle balk bar beat block cancel check circumvent confront conquer counter counteract cramp cramp one’s style crimp dash dash one’s hope defeat depress discourage dishearten foil forbid forestall foul up give the run around halt hang up hinder hold up impede inhibit lick negate neutralize nullify obstruct obviate outwit overcome preclude prevent prohibit render null and void ruin stump stymie upset the applecart

Antonyms: aid assist cooperate encourage facilitate help support