1. (a.) Vain; ineffectual; useless; unprofitable; null; void; nugatory; of no effect.

2. (v. t.) To bring to nothing; to prevent from attaining a purpose; to disappoint; to defeat; to baffle; as, to frustrate a plan, design, or attempt; to frustrate the will or purpose.

3. (v. t.) To make null; to nullify; to render invalid or of no effect; as, to frustrate a conveyance or deed.

annul anticipate arrest baffle balk bar beat bilk blast block brave bring to nothing buffalo buffer cancel cancel out cast down challenge check checkmate circumvent come to nothing confound confront conquer contravene counter counteract counterbalance countermand counterwork cripple cross dash deceive defeat defeat expectation defy destroy disappoint discomfit disconcert discountenance discourage dish disillusion disrupt dissatisfy elude evade exasperate flummox foil forbid forestall get around get round give the runaround give the slip go one better halt hamper hamstring hinder impede inhibit interrupt invalidate knock the chocks let down lick negate negativate negative neutralize nonplus nullify obstruct obviate offset outfigure outflank outgeneral outguess outmaneuver outplay outreach outsmart outwit overcome overreach pass the buck perplex preclude prevent prohibit redress repel repulse ruin sabotage scotch spike spoil stonewall stop stultify stump stymie tantalize tease thwart undo upset victimize vitiate void