say it: DETH-lee
deathly is an adjective and adverb meaning "having the physical appearance of death". It carries 4 recorded senses.
to a degree resembling death
“he was deathly pale”
to an extreme degree
“extremely cold”
“extremely unpleasant”
“she is super smart”
“the night was deathly cold”
“as a child, I was deathly afraid of snakes”
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 deathly 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.