a. Obs. rare. [ad. late L. frustrābilis, f. frustrārī: see FRUSTRATE v.] Capable of being frustrated or rendered ineffectual.
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.
1677. Gale, Crt. Gentiles, IV. 404. The Divine Wil is universally efficacious, insuperable nor impedible and frustrable in any manner.