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3 definitions found
 for inactive
From The Collaborative International Dictionary of English v.0.48 :

  Inactive \In*ac"tive\, a. [Pref. in- not + active: cf. F.
     [1913 Webster]
     1. Not active; having no power to move; that does not or can
        not produce results; inert; as, matter is, of itself,
        [1913 Webster]
     2. Not disposed to action or effort; not diligent or
        industrious; not busy; idle; as, an inactive officer.
        [1913 Webster]
     3. (Chem. & Opt.) Not exhibiting any action or activity on
        polarized light; optically inactive; optically neutral;
        -- said of isomeric forms of certain substances, in
        distinction from other forms which are optically active;
        as, racemic acid is an inactive tartaric acid.
        [1913 Webster]
     4. (Chem. & Biochem.) Lacking biological or biochemical
        activity; not causing a specific biological or biochemical
        effect; -- said of substances such as enzymes which have
        lost their catalytic power, or of small molecules which
        are tested for some type of biological activity and found
        to lack that activity; as, after boiling for ten minutes,
        the enzyme was totally inactive; the methyl analog was
        inactive as an antibiotic.
     Syn: Inert; dull; sluggish; idle; indolent; slothful; lazy.
          See Inert.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: (chemistry) not participating in a chemical reaction;
             chemically inert; "desired amounts of inactive chlorine"
      2: (pathology) not progressing or increasing; or progressing
         slowly [ant: active]
      3: (military) not involved in military operations [syn:
         nonoperational, inactive] [ant: operational]
      4: not exerting influence or change [ant: active]
      5: (of e.g. volcanos) not erupting and not extinct ; "a dormant
         volcano" [syn: dormant, inactive] [ant: active]
      6: lacking in energy or will; "Much benevolence of the passive
         order may be traced to a disinclination to inflict pain upon
         oneself"- George Meredith [syn: passive, inactive] [ant:
      7: lacking activity; lying idle or unused; "an inactive mine";
         "inactive accounts"; "inactive machinery" [ant: active]
      8: not engaged in full-time work; "inactive reserve"; "an
         inactive member" [ant: active]
      9: not active physically or mentally; "illness forced him to
         live an inactive life"; "dreamy and inactive by nature" [ant:
      10: not in physical motion; "the inertia of an object at rest"
          [syn: inactive, motionless, static, still]

From Moby Thesaurus II by Grady Ward, 1.0 :

  94 Moby Thesaurus words for "inactive":
     abeyant, apathetic, asleep, at a standstill, cataleptic, catatonic,
     contemplative, dead, deliberate, disengaged, do-nothing, dopey,
     dormant, dull, easy, flat, foul, groggy, hasteless, heavy, idle,
     immobile, in abeyance, in suspense, inanimate, indolent, inert,
     inoperative, jobless, lackadaisical, laissez-aller, laissez-faire,
     languid, languorous, latent, lazy, leaden, leisurely, lethargic,
     lifeless, listless, logy, meditative, motionless, neuter, neutral,
     ossified, out of work, pacific, paralytic, paralyzed, passive,
     peaceful, phlegmatic, placid, procrastinating, quiescent, quiet,
     quietist, quietistic, relaxed, resting, sedentary, serene, slack,
     sleeping, sleepy, slothful, slow, sluggish, slumbering, smoldering,
     somnolent, stagnant, stagnating, standing, standpat, static,
     stationary, still, supine, suspended, tame, torpid, tranquil,
     unactive, unaroused, unemployed, unhasty, unhurried, unmoving,
     unoccupied, vegetable, vegetative

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