1. [ adjective ] unable to move or resist motion
Related terms: nonmoving
2. [ adjective ] (chemistry) having only a limited ability to react chemically; not active
Synonyms: neutral indifferent

"inert matter" "an indifferent chemical in a reaction"

Related terms: chemistry unreactive
3. [ adjective ] slow and apathetic
Synonyms: torpid sluggish

"she was fat and inert" "a sluggish worker" "a mind grown torpid in old age"

Related terms: inactive
Similar spelling:   inertia