उदाहरण : A baleful look.
Forbidding thunderclouds.
His tone became menacing.
Ominous rumblings of discontent.
Sinister storm clouds.
A sinister smile.
His threatening behavior.
Ugly black clouds.
The situation became ugly.

पर्यायवाची : baleful, forbidding, menacing, minacious, minatory, ominous, threatening

उदाहरण : Black deeds.
A black lie.
His black heart has concocted yet another black deed.
Darth Vader of the dark side.
A dark purpose.
Dark undercurrents of ethnic hostility.
The scheme of some sinister intelligence bent on punishing him.

पर्यायवाची : black, dark

उदाहरण : Bar sinister.