frustrate

Concise Oxford English Dictionary © 2008 Oxford University Press:
frustrate/frʌˈstreɪt/

▶verb

• 1 prevent (a plan or action) from progressing, succeeding, or being fulfilled.

  ■ prevent (someone) from doing or achieving something.

• 2 cause (someone) to feel dissatisfied or unfulfilled.

▶adjective archaic frustrated.

– derivatives
frustrater noun,
frustrating adjective,
frustratingly adverb,
frustration noun.

– origin ME: from L. frustrat-, frustrare ‘disappoint’, from frustra ‘in vain’.