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