alarming
/ə.ˈlɑːm.ɪŋ/verb
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To call to arms for defense
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To give (someone) notice of approaching danger
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To rouse to vigilance and action; to put on the alert.
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To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
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To keep in excitement; to disturb.
adjective
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Causing apprehension, fear or alarm; frightening