simple past tense and past participle of frustrate

Foiled, stopped, disappointed. / Suffering from frustration; dissatisfied, agitated, and/or discontent because one is unable to perform an action or fulfill a desire.

(obsolete, rare) in vain

Third-person singular simple present indicative form of frustrate

ineffectual; useless; fruitless.

(transitive) To disappoint or defeat; to vex by depriving of something expected or desired. / (transitive) To hinder or thwart. / (transitive) To cause stress or annoyance.

The feeling of annoyance at impassibility from resistance. / The act of frustrating, or the state, or an instance of being frustrated.

Discouraging; causing annoyance or anger by excessive difficulty.

present participle of frustrate

plural of frustration