ominous vs minacious

ominous and minacious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ominous	No	Yes	No	No
minacious	No	Yes	No	No

As adjectives, ominous and minacious are synonyms defined as:

ominous and minacious: threatening or foreshadowing evil or tragic developments

Other synonyms of ominous include baleful, forbidding, menacing, minatory, sinister, threatening.

ominous (adjective)	minacious (adjective)
threatening or foreshadowing evil or tragic developments	threatening or foreshadowing evil or tragic developments
presaging ill fortune