Synonyms of the word

minatory

• adj. Threatening, menacing.

alarming

• v. present participle of alarm.
• adj. causing apprehension, fear or alarm; frightening.

baleful

• adj. Portending evil; ominous.
• adj. Miserable, wretched, distressed, suffering.

forbidding

• adj. highly unpleasant or disagreeable.
• adj. threatening or menacing.
• v. present participle of forbid.
• n. The act by which something is forbidden; a prohibition.

menacing

• adj. Suggesting imminent harm.
• adj. Threatening.
• v. present participle of menace.
• n. The act of making menaces or threats.

minacious

• adj. (now rare) Threatening, menacing.

ominous

• adj. Of or pertaining to an omen or to omens; being or exhibiting an omen; significant.
• adj. Specifically, giving indication of a coming ill; being an evil omen; threatening; portentous; inauspicious.

sinister

• adj. Inauspicious, ominous, unlucky, illegitimate (as in bar sinister).
• adj. Evil or seemingly evil; indicating lurking danger or harm.
• adj. Of the left side.
• adj. (heraldry) On the left side of a shield from the wearer's standpoint, and the right side to the viewer.
• adj. (obsolete) Wrong, as springing from indirection or obliquity; perverse; dishonest.

threatening

• v. present participle of threaten.
• adj. Presenting a threat; menacing; frightening.
• n. An act of threatening; a threat.