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say it: in-URT
inert is an adjective meaning "unable to move or resist motion". It carries 3 recorded senses.
unable to move or resist motion
having only a limited ability to react chemically; chemically inactive
“inert matter”
“an indifferent chemical in a reaction”
chemistry
slow and apathetic
“she was fat and inert”
“a sluggish worker”
“a mind grown torpid in old age”
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 inert 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.