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say it: DED-lee
deadly is an adjective and adverb meaning "causing or capable of causing death". It carries 8 recorded senses.
involving loss of divine grace or spiritual death
“the seven deadly sins”
theology
exceedingly harmful
(of a disease) having a rapid course and violent effect
as if dead
(used as intensives) extremely
“she was madly in love”
“deadly dull”
“deadly earnest”
“deucedly clever”
“insanely jealous”
intensifier
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for deadly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.