In*ac"tive(?), a. [Pref. in- not + active: cf. F. inactif.]
1. Not active; having no power to move; that does not or can not produce results; inert; as, matter is, of itself,
2. Not disposed to action or effort; not diligent or industrious; not busy; idle; as, an
(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.
(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.
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Sat 15th December 2018