If it's threatening you or otherwise posing some sort of danger, then it's a menace. Angry rabid dogs, smog clouds, and annoying little brothers are all probable menaces.

The word menace works as both a noun and a verb, but it wasn't used to describe threatening or bothersome people until 1936. Before then, common menaces probably included things like the plague, locusts, and roving bands of pirate ships. Today, a bad reputation can menace an otherwise promising career, weeds can menace your garden, and burglars are a menace to society.

Definitions of menace

n something that is a source of danger

yellow peril
the threat to Western civilization said to arise from the power of Asiatic peoples
Type of:
a cause of pain or injury or loss

n a threat or the act of threatening

“he spoke with desperate menace
Type of:
declaration of an intention or a determination to inflict harm on another

v pose a threat to; present a danger to

endanger, imperil, jeopardise, jeopardize, peril, threaten
Type of:
be, exist
have an existence, be extant

v express a threat either by an utterance or a gesture

“he menaced the bank manager with a stick”
Type of:
evince, express, show
give expression to

v act in a threatening manner

“A menacing person”
Type of:
act, behave, do
behave in a certain manner; show a certain behavior; conduct or comport oneself

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