NEFANDOUS

Etymology

Adjective

nefandous (comparative more nefandous, superlative most nefandous)

(archaic) Unspeakable, appalling.

Source: Wiktionary

Ne"fand, Ne*fan"dous, a. Etym: [L. nefandus not to be spoken; ne not + fari to speak.]

Definition: Unfit to speak of; unmentionable; impious; execrable. [Obs.] "Nefand adominations." Sheldon. "Nefandous high treason." Cotton Mather.

Source: Webster’s Unabridged Dictionary 1913 Edition