Of or pertaining to an omen or to omens; being or exhibiting an omen; significant. / Specifically, giving indication of a coming ill; being an evil omen

In an ominous manner; with sinister foreboding.

The quality of being ominous.

plural of ominousness

Third-person singular simple present indicative form of ominate

(obsolete, transitive) To presage; to foreshow; to foretoken.

simple past tense and past participle of ominate

present participle of ominate

(obsolete) The act of ominating; presaging; to omen.

A surname from Japanese.