Ranked by relevance and common usage.
Keep "ominously" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "ominously" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "ominously", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "ominously" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
6 total sentences available.
An anthropologist wrongly applied the word "Semitic" not just to languages like Arabic, Amharic, Tigrinya and Hebrew but specifically to ethnically and culturally Jewish people. More ominously, from 1880 through the Nazi period of German history, racists extended the word "Aryan," which had meant the Sanskrit-Persian language family, to deliberately foster the vile and discredited theory of a so-called Aryan race.
Source: tatoeba (8113157)
The thunder rumbled ominously in the distance.
Source: tatoeba (12396132)
From first to last he was ominously polite, and ominously silent.
Source: wiktionary
His nostrils flared ominously and his fists opened and closed at his sides.
Source: wiktionary
Showing 4 of 6 available sentences.
Closest matches include balefully, deathly, fearfully, forebodingly, menacingly.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.