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say it: ROOTH-luhs
ruthless is an adjective meaning "without mercy or pity". It carries one recorded sense.
without mercy or pity
“an act of ruthless ferocity”
“a monster of remorseless cruelty”
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 ruthless 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.