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inactive

[in-ak-tiv] /ɪnˈæk tɪv/
adjective
1.
not active:
an inactive volcano.
2.
sedentary or passive:
an inactive life.
3.
sluggish; indolent.
4.
Military. not on active duty.
5.
Chemistry.
  1. inert; unreactive.
  2. noting a compound that has no effect on polarized light.
Origin
1715-1725
1715-25; in-3 + active
Related forms
inactively, adverb
inactivity, inactiveness, noun
Synonyms
1. unmoving, immobile, inoperative. 1, 2. Inactive, dormant, inert, sluggish, torpid suggest lack of activity. Inactive indicates absence of action, indisposition to activity, or cessation of activity: an inactive compound, life, file of papers. Dormant suggests the quiescence or inactivity of that which sleeps but may be roused to action: a dormant volcano. Inert suggests the condition of dead matter, with no inherent power of motion or action; it may also mean unable to move, or heavy and hard to move: an inert mass; inert from hunger. Sluggish expresses slowness of natural activity or of that which does not move readily or vigorously: a sluggish stream, brain. Torpid suggests a state of suspended physical powers, a condition particularly of animals that hibernate: Snakes are torpid in cold weather. 3. lazy, idle, slothful.
Antonyms
1–3. lively.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in activity

inactive

/ɪnˈæktɪv/
adjective
1.
idle or inert; not active
2.
sluggish, passive, or indolent
3.
(military) of or relating to persons or equipment not in active service
4.
(chem) (of a substance) having little or no reactivity
5.
(of an element, isotope, etc) having little or no radioactivity
Derived Forms
inactively, adverb
inactivity, inactiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for in activity

inactive

adj.

1725, from in- (1) "not, opposite of" + active.

Online Etymology Dictionary, © 2010 Douglas Harper
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3
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