Synonym: calm, idle, motionless, sluggish, still. Antonym: active. Similar words: in action, active, actively, proactive, hyperactive, attractive, radioactive, interactive. Meaning: ['ɪn'æktɪv] 
adj. 1. not participating in a chemical reaction; chemically inert 2. not progressing or increasing; or progressing slowly 3. not involved in military operations 4. not exerting influence or change 5. of e.g. volcanos; not erupting and not extinct 6. lacking in energy or will 7. lacking activity; lying idle or unused 8. not engaged in full-time work 9. not active physically or mentally 10. not in physical motion.
adj. 1. not participating in a chemical reaction; chemically inert 2. not progressing or increasing; or progressing slowly 3. not involved in military operations 4. not exerting influence or change 5. of e.g. volcanos; not erupting and not extinct 6. lacking in energy or will 7. lacking activity; lying idle or unused 8. not engaged in full-time work 9. not active physically or mentally 10. not in physical motion. 
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1 He certainly was not politically inactive.
2 It's bad for your health to be physically inactive.
3 The area has a large, but politically inactive population.
4 The volcano has been inactive for 50 years.
5 The brain cells are inactive during sleep.
6 Some animals are inactive during the daytime.
7 If you weren't so inactive you wouldn't be so fat!
8 Hedgehogs are inactive in winter.
9 The property market remains largely inactive.
10 He had been totally inactive for two weeks.
11 Young people are becoming politically inactive.
12 Graham's knee injury means he will be inactive for Sunday's game.
13 He became politically inactive in the new century.
14 Illness rendered Clarke inactive in the 1700s.
15 Very shy people often become socially inactive.
16 The other half will receive an inactive placebo.
17 She dreads becoming old and inactive.
18 However, the outer surfaces are inactive in coagulation tests.
19 This vibration is therefore inactive in the IR spectrum.
20 Down deep, Clive was unimaginative, inactive, petty, unquestioning.
21 Hahnemann found that many substances which were inactive in the crude form became active therapeutic agents when treated in this way.
22 Most are now inactive, but when they first arrived they were able to hop from place to place in our genome.
23 The fault, which scientists had believed was inactive, caused a 6.5 earthquake.
24 Fond as he is of his inactive comforts, he regrets all marriages as breaking up happy families.
25 It is impossible for a small company to gain on the big firms while business is so inactive.
26 It is impossible for a small company to gain on the big one while business is so inactive.
27 The total time used in food preparation consists of active time and inactive time when attention may be directed elsewhere.
28 A number of generals directly involved in the May violence in Bangkok were shifted to inactive posts.
29 By comparison with Alexander I and most eighteenth-century tsars he had been remarkably inactive beyond his frontiers.
30 Moreover by the 1750s the provincial parlements, hitherto relatively inactive,[www.Sentencedict.com] were increasingly following the lead of that of Paris.
More similar words: in action, active, actively, proactive, hyperactive, attractive, radioactive, interactive, unattractive, retroactively, active transport, affirmative action, activity, activist, deactivate, deductive, elective, addictive, inductive, objective, invective, effective, subjective, detective, adjective, afflictive, vindictive, respective, protective, productive.