impenitence, n. incontrition, obduracy, impenitency.

impenitent, a. incontrite, unrepentant, obdurate, incorrigible, recusant, relentless.

imperative, a. binding, compulsory, obligatory, imperious, peremptory.

imperfect, a. defective, faulty, deficient, undeveloped, abortive, fallible, frail, errable.

imperfection, n. defect, blemish, shortcoming, infirmity, foible, deformity, disfigurement, vice, frailty, fallibility.

imperious, a. despotic, magisterial, domineering, dictatorial, tyrannical, imperative.

imperishable, a. permanent, indestructible, enduring.

impersonate, v. personate; personify.

impersonation, n. personation, impersonating; impersonification.

impersonator, n. mimic, personator, mime, actor.

impertinent, a. irrelevant, inapplicable, impudent, saucy, rude, insolent, malapert, flippant.

impervious, a. impermeable, impenetrable, imperviable.

impetus, n. momentum, force, impulse, incentive.

impish, a. malignant.

implacable, a. unappeasable, vindictive, pitiless, irreconcilable.

implant, v. instill, inculcate, ingraft, infix.

implied, a. tacit, inferential.

implore, v. beseech, supplicate, entreat, obsecrate.

imploring, n. supplication, obsecration.

impolite, a. discourteous, inurbane, rude, uncivil, disrespectful, saucy, insolent, impertinent, churlish, brusque, unamiable, surly, gruff, boorish.

impoliteness, n. discourtesy, inurbanity, incivility, impertinence, insolence.

importance, n. moment, materiality, consequence; pomposity, self-importance.

important, a. momentous, material, essential; pompous, consequential.

impose upon. delude, dupe, deceive, victimize.

imposing, a. impressive, stately, majestic, august.

impossibility, n. impracticability.

impossible, a. impracticable, unfeasible, unattainable.

impostor, n. pretender, cheat, charlatan, mountebank, quack, deceiver.

imposture, n. fraud, imposition, charlatanism, deception.

impracticability, n. unfeasibility.

impracticable, a. impossible, unfeasible.

impregnate, v. fecundate.

impregnation, n. fecundation.

imprison, v. incarcerate, immure.

imprisonment, n. incarceration, durance, immurement, duress, confinement, commitment.

impromptu, a. improvised, offhand, extempore, extemporaneous.

improper, a. indecorous, unseemly, indecent, inappropriate, wrong, solecistic.

impropriety, n. unsuitableness, unfitness, indecorum, barbarism, solecism.

improve, v. amend, ameliorate, rectify, better, mend; utilize, use; gain, get better.

improvement, n. betterment, amelioration; meliorism; utilization.

improving, a. ameliorative, beneficial, amending.

impudence, n. insolence, impertinence, effrontery, rudeness.

impudent, a. insolent, impertinent, flippant, pert, brazen, saucy.

impulse, n. motive, incentive; impulsion, impetus.

impulsive, a. pa.s.sionate, capricious, hasty; impellent, propulsive.

impure, a. tainted, defiled, contaminated, polluted, vitiated, infected; adulterated, alloyed, sophisticated; unchaste, lewd, indelicate, indecent; barbarous, vulgar, hybrid.

impurity, n. defilement, contamination, taint, pollution; adulteration, alloy, sophistication; unchast.i.ty, lewdness, indecency, indelicacy; pl. garblings, garbles.

inability, n. incompetence, impotence, incapability, incompetency, inefficiency, disability.

in a body. altogether, _en ma.s.se_.

inaccuracy, n. inexactness, incorrectness, impropriety.