-frustrable-

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 ]

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 ]

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 ]