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say it: HAHRM-fuhl
harmful is an adjective meaning "causing or capable of causing harm". It carries one recorded sense.
causing or capable of causing harm
“too much sun is harmful to the skin”
“harmful effects of smoking”
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 harmful 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.