Synonyms : ban, banning, forbiddance

Example : A dour, self-sacrificing life.
A forbidding scowl.
A grim man loving duty more than humanity.
Undoubtedly the grimmest part of him was his iron claw.

Synonyms : dour, grim

Example : 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.

Synonyms : baleful, menacing, minacious, minatory, ominous, sinister, threatening