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im·po·si·tion noun : something imposed: as

a : an amount levied

b : an excessive or uncalled-for requirement or burden

im·pos·si·ble adjective 1 : incapable of being or of occurring

2 : enormously difficult : felt to be incapable of being done, attained, or fulfilled

3 : extremely undesirable : UNACCEPTABLE

— im·pos·si·bil·i·ty noun

— im·pos·si·bly adverb

Synonyms

hopeless, unattainable, unsolvable, unworkable; also impracticable, impractical; doubtful, dubious, improbable, unlikely; implausible, inconceivable, incredible, unbelievable, unthinkable; futile, useless; absurd, fantastic, outlandish, preposterous, ridiculous

Antonyms

achievable, attainable, doable, feasible, possible, realizable, workable

1impost noun : something imposed or levied : TAX, DUTY

Synonyms

assessment, duty, levy, tax—more at TAX

2impost noun : a block, capital, or molding from which an arch springs

im·pos·tor or im·pos·ter noun : one that assumes an identity or title not one's own in order to deceive

im·pos·ture noun : DECEPTION; especially : fraudulent impersonation

im·po·tence noun : the quality or state of being impotent

Synonyms

inability, inadequacy, incapability, incompetence, ineptitude—more at INABILITY

im·po·tent adjective 1 : lacking in power or strength : deficient in capacity

2 a : unable to copulate

b : failing to produce or incapable of producing offspring : STERILE

— im·po·ten·cy noun

— im·po·tent·ly adverb

Synonyms

[1] helpless, powerless, weak—more at POWERLESS

[2b] barren, infertile, sterile—more at STERILE

im·pound verb 1 : CONFINE, ENCLOSE <~ stray dogs>

2 : to seize and hold in legal custody

3 : to collect in a reservoir <~ water>

— im·pound·ment noun

im·pov·er·ish verb : to make poor; also : to deprive of strength, richness, or fertility

impoverished adjective, of a fauna or flora

: represented by few species or individuals

im·pov·er·ish·ment noun : the act of impoverishing or the state of being impoverished

Synonyms

beggary, destitution, impecuniousness, indigence, need, pauperism, penury, poverty, want—more at POVERTY

im·prac·ti·ca·ble adjective : not practicable : incapable of being put into practice or use

im·prac·ti·cal adjective 1 : not practical

2 : incapable of being done by the means available : IMPRACTICABLE

Synonyms

inoperable, unusable, unworkable, useless; also unsuitable; inaccessible, unattainable, unavailable, unobtainable, unreachable; dead, dormant, fallow, free, idle, inactive, inert, inoperative, latent; arrested, interrupted; unrealistic

Antonyms

practicable, practical, usable, useful, workable

im·pre·cate verb -cat·ed; -cat·ing : CURSE

im·pre·ca·tion noun : a prayer or invocation for harm or injury to come upon one; also : the act of imprecating

Synonyms

anathema, curse, execration, malediction—more at CURSE

im·pre·cise adjective : not precise

— im·pre·cise·ly adverb

— im·pre·cise·ness noun

— im·pre·ci·sion noun

Synonyms

inaccurate, inexact, loose—more at INEXACT

im·preg·na·ble adjective 1 : incapable of being taken by assault : UNCONQUERABLE

2 : not liable to doubt, attack, or question

— im·preg·na·bil·i·ty noun

Synonyms

indomitable, insurmountable, invincible, invulnerable, unbeatable, unconquerable—more at INVINCIBLE

im·preg·nate verb -nat·ed; -nat·ing 1 : to fertilize or make pregnant

2 : to cause to be filled, permeated, or saturated

— im·preg·na·tion noun

Synonyms

drench, drown, saturate, soak, sop, souse, steep—more at SOAK

im·pre·sa·rio noun, plural -ri·os [ORIGIN: It, fr. impresa undertaking, fr. imprendere to undertake]

1 : the manager or conductor of an opera or concert company

2 : one who puts on an entertainment

3 : MANAGER, PRODUCER

1impress verb 1 : to apply with or produce (as a mark) by pressure : IMPRINT

2 : to press, stamp, or print in or upon

3 : to imprint a vivid impression of (as on the memory)