thwart

thwart verb avert, baffle, balk, bar, blight, bring to naught, check, contravene, counteract, countermine, cripple, cross, damp, debar, defeat, foil, forestall, frustrate, hamper, hinder, impede, inhibit, intercept, interrupt, nip, obstruct, oppose, outmaneuver, override, preclude, prevent, restrain, retard, ruin, spoil, stave off, stifle, stop, stultify, stymie, traverse, turn aside, ward off

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See also: annoy, arrest, avert, balk, ban, bar, beat, block, check, circumvent, condemn, constrict, contain, contravene, counter, counteract, countervail, defeat, delay, deter, disadvantage, discontinue, discourage, disrupt, encumber, enjoin, estop, fight, foil, forestall, frustrate, halt, hamper, hinder, hold up, impede, inconvenience, inhibit, interdict, interfere, interrupt, keep, kill, obstruct, occlude, oppose, oppugn, overreach, override, parry, preclude, prevent, prohibit, repulse, resist, restrain, stay, stem, stop, toll, trammel, withstand