ominous

adj.

1. Menacing; threatening: ominous black clouds; ominous rumblings of discontent.
2. Of or being an omen, especially an evil one.

[Latin ōminōsus, from ōmen, ōmin-, omen.]

ominously om'i·nous·ly adv.
ominousness om'i·nous·ness n.

adjective

Portending future disaster: apocalyptic, apocalyptical, baneful, dire, direful, fateful, fire-and-brimstone, grave², hellfire, portentous, unlucky. See luck/misfortune/chance, warn/invite.

adj

Definition: menacing, foreboding
Antonyms: auspicious, happy, lucky, promising, propitious

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IN BRIEF: A sign of danger to come.

They sprang into action at the sight of the ominous smoke on the hilltop.

Ominous

Dansk (Danish)
adj. - ildevarslende, uheldsvanger

Nederlands (Dutch)
onheilspellend, sinister

Français (French)
adj. - menaçant, inquiétant, de mauvais augure

Deutsch (German)
adj. - beunruhigend, ominös, unheilvoll

Ελληνική (Greek)
adj. - δυσοίωνος, δυσμενής, απειλητικός, ανησυχητικός

Italiano (Italian)
sinistro

Português (Portuguese)
adj. - ominoso, agourento

Русский (Russian)
зловещий

Español (Spanish)
adj. - ominoso, de mal agüero, siniestro, nefasto

Svenska (Swedish)
adj. - illavarslande, olycksbådande, varslande

中文（简体）(Chinese (Simplified))
恶兆的, 预兆的, 不吉利的

中文（繁體）(Chinese (Traditional))
adj. - 惡兆的, 預兆的, 不吉利的

한국어 (Korean)
adj. - 불길한, ~의 전조의

日本語 (Japanese)
adj. - 不吉な, 不気味な

العربيه (Arabic)
‏(صفه) منذر بسوء, مشؤوم‏

עברית (Hebrew)
adj. - ‮מאיים, מהווה סימן רע‬

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