frustratory

== English == === Etymology === Latin frustrotorius: compare French frustratoire. === Adjective === frustratory (comparative more frustratory, superlative most frustratory) (obsolete) Making void; rendering null. === References === “frustratory”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.