Noun
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an official prohibition or edict against something
Adjective
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threatening or foreshadowing evil or tragic developments
"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"
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harshly uninviting or formidable in manner or appearance
"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"- J.M.Barrie