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inactive (adj.)

"not active or acting," 1640s, from in- (1) "not, opposite of" + active. Perhaps a back-formation from inactivity.

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Definitions of inactive

inactive (adj.)
(chemistry) not participating in a chemical reaction; chemically inert;
desired amounts of inactive chlorine
inactive (adj.)
(pathology) not progressing or increasing; or progressing slowly;
inactive (adj.)
not exerting influence or change;
inactive (adj.)
lacking in energy or will; "Much benevolence of the passive order may be traced to a disinclination to inflict pain upon oneself"- George Meredith;
Synonyms: passive
inactive (adj.)
lacking activity; lying idle or unused;
an inactive mine
inactive accounts
inactive machinery
inactive (adj.)
not engaged in full-time work;
an inactive member
inactive reserve
inactive (adj.)
not active physically or mentally;
illness forced him to live an inactive life
dreamy and inactive by nature
inactive (adj.)
not in physical motion;
Synonyms: motionless / static / still
inactive (adj.)
(military) not involved in military operations;
Synonyms: nonoperational
inactive (adj.)
(of e.g. volcanos) not erupting and not extinct;
Synonyms: dormant
From wordnet.princeton.edu