a. Obs. rare. [ad. late L. frustrābilis, f. frustrārī: see FRUSTRATE v.] Capable of being frustrated or rendered ineffectual.

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1674.  Hickman, Quinquart. Hist. (ed. 2), 176. The Dominicans, from whom it is likely he got nothing agreeable to the Jesuits notion of respective Decrees, and frustrable grace.

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1677.  Gale, Crt. Gentiles, IV. 404. The Divine Wil is universally efficacious, insuperable … nor impedible and frustrable in any manner.

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