frustrate

Verb

Synonyms: thwart queer spoil scotch foil cross baffle bilk torment rag bedevil crucify

WordNet 3.0

Verb (2)

hinder or prevent (the efforts, plans, or desires) of“What ultimately frustrated every challenger was Ruth's amazing September surge”“foil your opponent”Synonyms: thwart queer spoil scotch foil cross baffle bilk
treat cruelly“The children tormented the stuttering teacher”Synonyms: torment rag bedevil crucify dun

Webster's Dictionary (GCIDE)

Frustrate \Frus"trate\, a. [L. frustratus, p. p. of frustrare, frustrari, to deceive, frustrate, fr. frustra in vain, witout effect, in erorr, prob. for frudtra and akin to fraus, E. fraud.] Vain; ineffectual; useless; unprofitable; null; voil; nugatory; of no effect. "Our frustrate search." --Shak. [1913 Webster]

Frustrate \Frus"trate\, v. t. [imp. & p. p. Frustrated; p. pr. & vb. n. Frustrating.]

1.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. [1913 Webster]

Shall the adversary thus obtain His end and frustrate thine ?— Milton.[1913 Webster]

2.To make null; to nullifly; to render invalid or of no effect; as, to frustrate a conveyance or deed.

Syn: To balk; thwart; foil; baffle; defeat. [1913 Webster]