AskDefine | Define inert

Dictionary Definition

inert adj
1 unable to move or resist motion
2 having only a limited ability to react chemically; not active; "inert matter"; "an indifferent chemical in a reaction" [syn: indifferent, neutral]
3 slow and apathetic; "she was fat and inert"; "a sluggish worker"; "a mind grown torpid in old age" [syn: sluggish, torpid]

User Contributed Dictionary



  1. unable to move or act
  2. sluggish or lethargic
  3. in chemistry, not readily reacting with other elements or compounds
  4. having no therapeutic action


unable to move or act
sluggish or lethargic
in chemistry, not readily reacting with other elements or compounds
having no therapeutic action

Related terms

See also

Extensive Definition

In English, to be inert is to be in a state of doing little or nothing.
Example: "The balls are inert."


In chemistry, the term inert is used to describe something that is not chemically active. The noble gases were described as being inert because they did not react with the other elements or themselves. It is now understood that the reason that inert gases are completely inert to basic chemical reactions (such as combustion, for example), is because their outer valence shell is completely filled with electrons. With a filled outer valence shell, an inert atom is not easily able to acquire or lose an electron, and is therefore not able to participate in any chemical reactions. For inert atoms or molecules, a lot of energy is involved before it can combine with other elements to form compounds. A high temperature and pressure is necessary, and sometimes requires the presence of a catalyst.
For example, elemental nitrogen is inert under standard room conditions and exists as a diatomic molecule, N2. The inertness of nitrogen is due to the presence of the very strong triple covalent bond in the N2 molecule.
Inert atmospheres of gases such as dinitrogen and argon are routinely used in chemical reactions where air sensitive and water sensitive compounds are handled.

Number theory

In the branch of mathematics known as algebraic number theory, a prime ideal is said to be inert if it is still prime when considered in an extension field. Such a prime might have instead split as a product of other prime ideals, but by being inert it remains essentially unchanged.


In the area of weapons, an inert munition is one in which all energetic material such as primer, fuze, and explosive or incendiary fill have been removed or rendered harmless. Inert munitions are used in military training and are collected in museums and by private individuals. See also military dummy.
inert in Arabic: خامل
inert in Bavarian: Inert
inert in Czech: Inertní
inert in German: Inerte Substanz
inert in Estonian: Inertsus (keemia)
inert in French: Inerte
inert in Dutch: Inertie (chemie)
inert in Simple English: Inert
inert in Finnish: Inertti

Synonyms, Antonyms and Related Words

abeyant, abiotic, apathetic, asleep, azoic, benumbed, blase, bored, cataleptic, catatonic, changeless, constant, contemplative, dead, debilitated, do-nothing, dopey, dormant, droopy, drugged, dull, dumb, enervated, exanimate, flat, foul, groggy, heavy, hebetudinous, idle, immobile, immutable, impassive, impotent, in abeyance, in suspense, inactive, inanimate, inanimated, incommutable, inconvertible, indefeasible, indolent, insensate, insensible, insentient, insusceptible of change, intransmutable, invariable, irretrievable, irreversible, irrevocable, jaded, lackadaisical, laissez-aller, laissez-faire, languid, languorous, lasting, latent, lazy, leaden, lethargic, lifeless, listless, logy, lumpish, meditative, moribund, motionless, mute, neuter, neutral, noble, nonconscious, nonliving, nonreturnable, nonreversible, numb, otiose, paralytic, paralyzed, passive, permanent, phlegmatic, pooped, powerless, procrastinating, quiescent, quiet, quietist, quietistic, reverseless, sated, sedentary, senseless, slack, sleeping, sleepy, slothful, slow, sluggish, slumbering, smoldering, somnolent, soulless, stagnant, stagnating, standing, standpat, static, stationary, still, stolid, stultified, supine, suspended, tame, torpid, unalterable, unalterative, unaltered, unanimated, unaroused, unchangeable, unchanged, unchanging, unconscious, undeflectable, undeviating, unfeeling, unmodifiable, unremitting, unresponsive, unrestorable, unreturnable, unsusceptible, unvariable, unvarying, vegetable, vegetative, wan, weary, world-weary
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