minacious

adj.
Of a menacing or threatening nature; minatory.

[Latin mināx, mināc- (from minārī, to threaten , from minae, threats) + -IOUS.]

minaciously mi·na'cious·ly adv.
minaciousness mi·na'cious·ness or mi·nac'i·ty (mĭ-năs'ĭ-tē) n.

adjective

Expressing, indicating, or warning of an impending danger or misfortune: minatory, threatening. See foresight, near/far/distance.

[fr. L. minax, threatening]  /meh NAY shus/  
now rare  meanacing, threatening: minatory

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The adjective has one meaning:

Meaning #1: threatening or foreshadowing evil or tragic developments
  Synonyms: baleful, forbidding, menacing, minatory, ominous, sinister, threatening, ugly

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