etymologeek.com dictionary
English word ominous comes from Latin os, Latin -men (Forms neuter nouns of the third declension.).

Ominous etymology history?

Ominous detailed word origin explanation

Dictionary entryLanguageDefinition
os Latin (lat) (poetic) speech. Face, appearance, head. Mouth. Opening, entrance Bone. Framework of discourse. Heartwood. The hard or innermost part of trees or fruits.
-men Latin (lat) Forms neuter nouns of the third declension.
omen Latin (lat) An omen.
ominosus Latin (lat) Foreboding, ominous, portentous.
ominous English (eng) 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.

Words with the same origin as ominous

Descendants of os
abomination adorable adore omen oral
Descendants of -men
abdomen discrimination realm regime specimen volume