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Incapable of being read; not legible; as, illegible handwriting; an illegible inscription. -- Il*leg"i*ble*ness, n. -- Il*leg"i*bly, adv.

Not leviable; incapable of being imposed, or collected. [R.] Sir M. Hale.

Incapable of being limited or bounded; immeasurable; limitless; boundless; as, illimitable space. The wild, the irregular, the illimitable, and the luxuriant, have their appropriate force of beauty. De Quincey.

Incapable of being moved; immovable; fixed; stable. Prof. Shedd.

Incapable of being moved; firmly fixed; fast; -- used of material things; as, an immovable foundatin. Immovable, infixed, and frozen round. Milton.

The quality of being incapable of division into parts; indivisibility. Holland.

Incapable of being passed; not admitting a passage; as, an impassable road, mountain, or gulf. Milton. -- Im*pass"a*ble*ness, n. -- Im*pass"a*bly, adv.

Incapable of suffering; inaccessible to harm or pain; not to be touched or moved to passion or sympathy; unfeeling, or not showing feeling; without sensation. "Impassible to the critic." Sir W. Scott. Secure of death, I should contemn thy dart Though naked, and impassible depart. Dryden.

Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield. Highest woods impenetrable To star or sunlight. Milton.

Incapable of being mad perfect. [R.]

Incapable of being perforated, or bored through.

Incapable of being passed through. [R.]

Incapable of being disturbed or disconcerted; as, imperturbable gravity.

Not placable; not to be appeased; incapable of being pacified; inexorable; as, an implacable prince. I see thou art implacable. Milton. An object of implacable enmity. Macaulay.

Not ponderable; without sensible or appreciable weight; incapable of being weighed.

Not possible; incapable of being done, of existing, etc.; unattainable in the nature of things, or by means at command; insuperably difficult under the circumstances; absurd or impracticable; not feasible. With men this is impossible; but with God all things are possible. Matt. xix. 26. Without faith it is impossible t…

Not practicable; incapable of being performed, or accomplished by the means employed, or at command; impossible; as, an impracticable undertaking.

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.

An inseparable prefix, or particle, meaning not, non-, un- as, inactive, incapable, inapt. In- regularly becomes il- before l, ir- before r, and im- before a labial.

Incapable of being assisted; helpless. [R.] Shak.