FRUSTRATE

I. transitive verb (~d; frustrating) Etymology: Middle English, from Latin frustratus, past participle of frustrare to deceive, ~, from frustra in error, in vain Date: 15th century 1. to balk or defeat in an endeavor, to induce feelings of discouragement in, 2. a. to make ineffectual ; bring to nothing, impede , obstruct , to make invalid or of no effect, Synonyms: see: ~ II. adjective Date: 15th century characterized by frustration