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Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue. The man's affection remains wholly unconcerned and impregnable. South. -- Im*preg"na*ble*ness, n. -- Im*preg"na*bly, adv.

Not capable of being lost or impaired by neglect, by disuse, or by the claims of another founded on prescription. The right of navigation, fishing, and others that may be exercised on the sea, belonging to the right of mere ability, are imprescriptible. Vattel (Trans. )

Capable of being impressed; susceptible; sensitive. -- Im*press"i*ble*ness, n. -- Im*press"i*bly, adv.

Liable or subject to impression; capable of being molded; susceptible; impressible. He was too impressionable; he had too much of the temperament of genius. Motley. A pretty face and an impressionable disposition. T. Hook.

Capable of being impressed. [Obs.] Drayton. - Im*press"ive*ly, adv. -- Im*press"ive*ness, n.

Capable of being improved; susceptible of improvement; admitting of being made better; capable of cultivation, or of being advanced in good qualities. Man is accommodated with moral principles, improvable by the exercise of his faculties. Sir M. Hale. I have a fine spread of improvable lands. Addison.…

Capable of being impugned; that may be gainsaid.

That may be imputed; capable of being imputed; chargeable; ascribable; attributable; referable. A prince whose political vices, at least, were imputable to mental incapacity. Prescott.

Not capable of being calculated; beyond calculation; very great. -- In*cal"cu*la*ble*ness, n. -- In*cal"cu*la*bly, adv.

ough to contain or hold; deficient in physical strength, mental or moral power, etc.; not capable; as, incapable of holding a certain quantity of liquid; incapable of endurance, of comprehension, of perseverance, of reform, etc.

Capable of being incinerated or reduced to ashes. Sir T. Browne.

Capable of being included.

Not to be coerced; incapable of being compelled or forced.

Not combustible; not capable of being burned, decomposed, or consumed by fire; uninflammable; as, asbestus is an incombustible substance; carbon dioxide is an incombustible gas. Incombustible cloth, a tissue of amianthus or asbestus; also, a fabric imbued with an incombustible substance. -- In`com*bus"ti*ble*ness, n.…

Not commutable; not capable of being exchanged with, or substituted for, another. Cudworth. -- In`com*mut"a*ble*ness, n. -- In`com*mut"a*bly, adv.

Not capable of joint existence; incompatible; inconsistent. [Obs.] Ambition and faith . . . are . . . incompossible. Jer. Taylor. -- In`com*pos`si*bil"i*ty, n. [Obs.]

Not capable of being contained within limits. An infinite and incomprehensible substance. Hooker.

Not comprehensive; not capable of including or of understanding; not extensive; limited. -- In*com`pre*hen"sive*ly, a. Sir W. Hamilton. -- In*com`pre*hen"sive*ness, n. T. Warton.

Not congruous; reciprocally disagreeing; not capable of harmonizing or readily assimilating; inharmonious; inappropriate; unsuitable; not fitting; inconsistent; improper; as, an incongruous remark; incongruous behavior, action, dress, etc. "Incongruous mixtures of opinions." I. Taylor. "Made up of incongruous parts." M…

The quality or state of being inconvertible; not capable of being exchanged for, or converted into, something else; as, the inconvertibility of an irredeemable currency, or of lead, into gold.