Presenting a threat; menacing; frightening.(adjective)
An act of threatening; a threat.(noun)
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Use "threatening" in a sentence
"After Saturday's late disappointment left his team's tilt for the title threatening to sink into quicksand, the Arsenal manager, having"
"“You cannot back out on me now,” he said, his expression threatening."
"But to the threatening is annexed a promise that this shall be a means to convince them of their folly, and bring them home to their duty; and so good shall be brought out of evil, in token of the mercy God has yet in reserve for them."