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WORDNET DICTIONARY

Adjective minacious has 1 sense

• minacious(s = adj.all) baleful, forbidding, menacing, minatory, ominous, sinister, threatening - 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"

CIDE DICTIONARY

ROGET THESAURUS

minacious

Threat

N threat, menace, defiance, abuse, minacity, intimidation, denunciation, fulmination, commination, gathering clouds, threatening, menacing, minatory, minacious, comminatory, abusive, in terrorem, ominous, defiant, under the ban, Int, vae victis!, at your peril!, do your worst!.

For further exploring for "minacious" in Webster Dictionary Online