immodest, a. indecorous, indelicate, shameless; lewd, unchaste, obscene.

immodesty, n. indecorum, indelicacy, impudicity; lewdness, unchastity, obscenity.

immoral, a. licentious, dissolute, vicious, profligate, loose, illicit, rakish.

immorality, n. vice, licentiousness, depravity, profligacy, obliquity.

immortality, n. deathlessness, athanasia; perpetuity.

immovable, a. fast, permanent, impassive, firm, steadfast.

impact, n. collision, forcible contact; force.

impart, v. communicate.

impartial, a. equitable, fair, disinterested, unbiased, unprejudiced.

impartiality, n. fairness, equity, disinterestedness, justice.

impassable, a. impenetrable, pathless, impervious.

impatient, a. restless, restive, fretful, eager, impetuous.

impede, v. retard.

impediment, n. obstacle, barrier, obstruction, stumblingblock.

impending, a. imminent, threatening.

impenetrable, a. impervious, imperforable.

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.