US /ˈdɛdli/ UK /ˈdɛdli/
adj adv Freq #3937

Meanings

  1. 1
    adj

    Able to cause death.

    The snake's bite can be deadly without quick treatment.

  2. 2
    adj

    Extremely accurate and effective.

    The striker has a deadly aim in front of goal.

  3. 3
    adj

    Showing strong hatred and a wish to destroy.

    The two families had been deadly enemies for years.

Thesaurus

Synonyms
1 adj · able to cause death. lethal
Word family
Forms deadlierdeadliest
Derived forms deadlihooddeadlilydeadlinessfail-deadlynondeadlyundeadly
Related forms dead

Common collocations

Etymology

From Middle English dedly, dedlych, dedlich, from Old English dēadlīċ (adjective), from Proto-West Germanic *dauþalīk, from Proto-Germanic *dauþalīkaz (“deadly”, literally “deathly”). By surface analysis, dead + -ly. Cognate with Saterland Frisian dodelk (“deadly”), West Frisian deadlik (“deadly”), Dutch dodelijk (“deadly”), German tödlich (“deadly”), Swedish dödlig (“deadly, fatal, mortal”), Icelandic dauðlegur (“mortal”). The adverb is from Middle English dedliche, from Old English dēadlīċe (adverb), from the adjective.

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