a. | 1. | Vain; ineffectual; useless; unprofitable; null; voil; nugatory; of no effect. |
v. t. | 1. | To bring to nothing; to prevent from attaining a purpose; to disappoint; to defeat; to baffle; |
2. | To make null; to nullifly; to render invalid or of no effect; |
Verb | 1. | frustrate - hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent" |
2. | frustrate - treat cruelly; "The children tormented the stuttering teacher" |