The Collaborative International Dictionary
Minacious \Mi*na"cious\, a. [L. minax, -acis. See Menace.] Threatening; menacing. [R.]
Douglas Harper's Etymology Dictionary
Wiktionary
a. (context now rare English) threatening, menacing.
WordNet
adj. threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly black clouds"; "the situation became ugly" [syn: baleful, forbidding, menacing, minatory, ominous, sinister, threatening, ugly]
Usage examples of "minacious".
Of coursethe stair ended below the uttermost dregs of the minacious Ravenswater.
They were all hymns and ballads of a minacious description, now one and now another of which he kept repeating in lugubrious recitative.