adjective

deadly

deadly, fatal, lethal

This is a deadly poison.

This is a deadly poison.

She gave him a deadly look.

She gave him a deadly look.

The meeting was deadly dull.

The meeting was deadly dull.

a deadly ((noun)) a noun that is fatal It was a deadly weapon.

deadly ((adjective/adverb)) extremely The exam was deadly serious.

Synonyms: fatal, lethal, mortal; Antonyms: harmless, safe

From 'dead' + '-ly' (adjective-forming suffix). Meaning 'like death' or 'causing death'.

Something that can make you 'dead' is 'deadly'.

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