## Etymology
From threatening (present participle of threaten, from Old English threatnian) + the adverbial suffix -ly, ultimately from threat ('oppression, crowd').

## AI Etymology
Threateningly is from threatening (present participle of threaten, from Old English threatnian) + the adverbial suffix -ly, ultimately from threat ('oppression, crowd'). Important recorded forms include threatnian (Old English) and threat (Old English). Morphologically, the -ly ending turns the base adjective or participial form into an adverbial manner word, or preserves an older adjectival pattern where the part of speech allows it. The modern sense is largely compositional, with the historical elements narrowing into a stable English lexical item. In current use it covers in a manner that suggests danger or harm. The wider family includes related words such as threatening, threaten, and threat.

## Topics
- Safety & Risk
- Word Formation & Derivatives

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threateningly

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