Definition of frustrate

• a. - Vain; ineffectual; useless; unprofitable; null; voil; nugatory; of no effect.
• 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.
• v. t. - To make null; to nullifly; to render invalid or of no effect; as, to frustrate a conveyance or deed.