3. deficient, insufficient, inadequate; mediocre, indifferent, middling, below par, so-so, mean, average, fair, moderate, ordinary; inferior, crude, rough, bad, inexact.
imperfection, n. 1. defect, flaw, fault, blemish; snag, catch, tear, rent, run, Chiefly Brit, ladder; cut, scratch, crack, break; spot, taint, stain; deformity, disfigurement, malformation.
2. imperfectness, defectiveness, faultiness, weakness, infirmity, frailty; inadequacy, inferiority, unsoundness, deficiency, drawback; incompleteness, immaturity; shortcoming, foible, weak point, liability, limitation, failing; omission, transgression, misdeed, error, offense, vice, wrong, sinfulness, badness.
imperial, adj. 1. sovereign, regal, royal, monarchal, imperatorial; kingly, kinglike, queenly, queenlike, princely.
2. supreme, absolute, dominant, predominant, preeminent, paramount, chief, ruling.
3. commanding, mandating, imperative, prescriptive, authoritative; imperious, peremptory, overbearing, domineering, lordly, magisterial, masterful; authoritarian, dogmatic, despotic, dictatorial, tyrannical, arbitrary.
4. majestic, magnificent, splendid, grand, lofty, imposing, stately.
imperialism, n. 1. sovereignty, empire, empery, emperorship, royalty, majesty; kingship, kinghood, queenship, queenhood; the throne, the crown, the scepter, the purple.
2. monarchism, royalism; expansionism, colonialism, neocolonialism, the white man's burden.
imperil, v. endanger, expose to danger, jeopardize, put in jeopardy, compromise, Sl. put on the spot, Sl. lay on the line; hazard, risk, gamble, gamble with, tempt fate or providence, take a chance, play with fire, sail too near the wind, Inf. press or push one's luck, expose, lay open, bare.
imperious, adj. 1. peremptory, overbearing, overweening, domineering, high-handed, hands-on, Inf. bossy; commanding, lordly, high-and-mighty, magisterial, masterful; bumptious, assertive, heavy-handed; authoritarian, dogmatic, arbitrary, despotic, dictatorial, tyrannical.
2. urgent, exigent, compelling, pressing, imperative, high-priority, high-pressure; necessary, vital, indispensable, essential, of the essence; requisite, required, called-for, in demand, needful, needed.
imperishable, adj. indestructible, inextinguishable, indissoluble, infrangible, unbreakable; indelible, ineradicable; immutable, unalterable, unchangeable, changeless, incommutable; unfading, undecaying, incorruptible, amaranthine, perennial, (of leaves) Bot. in-deciduous, (of trees) Bot. evergreen; enduring, lasting, abiding, everlasting, eternal, Archaic, eterne, immortal.
impermanent, adj. transitory, transient, temporary, temporal, fly-by-night; momentary, short-lived, ephemeral, evanescent, volatile, passing, fleeting, fading, flitting; mortal, perishable, corruptible, unendurable, nonpermanent; mutable, changeable, changeful, alterable, variable, permutable, inconstant; unstable, unfixed, unsteady, unsettled.
impermeable, adj. 1. impenetrable, impassable, impervious, imperviable, inaccessible; jungly, jungled, overgrown; trackless, pathless, wayless, untrodden, Obs. invious.
2. proof, resistant, tight, airtight, snug, compact, hermetic, hermetically sealed; closed, shut, sealed, locked; solid, hard, rock-hard, adamantine; unporous, nonporous, watertight, waterproof.
impersonal, adj. 1. detached, disinterested, dispassionate, objective, nonsubjective, fair, even-handed,