"inerter" in the adjective sense
unable to move or resist motion
2. inert, indifferent, neutral
having only a limited ability to react chemically chemically inactive
"an indifferent chemical in a reaction"
3. inert, sluggish, soggy, torpid
slow and apathetic
"she was fat and inert"
"a sluggish worker"
"a mind grown torpid in old age"
Source: WordNet® (An amazing lexical database of English)
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