FRUSTRATELY
Frus"trate*ly, adv.
Defn: In vain. [Obs.] Vicars.
FRUSTRATION
Frus*tra"tion, n. Etym: [L. frustratio: cf. OF. frustration.]
Defn: The act of frustrating; disappointment; defeat; as, the frustration of one's designs
FRUSTRATIVE
Frus"tra*tive, a.
Defn: Tending to defeat; fallacious. [Obs.] Ainsworth.
FRUSTRATORY
Frus"tra*to*ry, a. Etym: [L. frustrotorius: cf. F. frustratoire.]
Defn: Making void; rendering null; as, a frustratory appeal. [Obs.]
Ayliffe.
FRUSTULE Frus"tule, n. Etym: [L. frustulum, dim. fr. frustum a piece: cf. F. frustule.] (Bot.)
Defn: The siliceous shell of a diatom. It is composed of two valves, one overlapping the other, like a pill box and its cover.