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Synonyms for impossible

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  1. Incapable of being considered

    inconceivable, unthinkable, vain, hopeless, infeasible, unachievable, unattainable, out of the question, insurmountable, useless, impassable, inaccessible, unworkable, preposterous, absurd, illogical, incredible, untenable, implausible, unimaginable, unobtainable, not to be thought of, hardly possible, beyond the bounds of possibility, like finding a needle in a haystack*, a hundred to one*; see also futile 1, hopeless 2.

    Antonyms possible*, likely, reasonable.

  2. Having little likelihood of accomplishment

    improbable, unlikely, impracticable, too much for; see difficult 1, 2.

  3. Undesirable; said of things

    unacceptable, improper, objectionable, incongruous; see offensive 2, undesirable, unsuitable.

  4. Disagreeable; said of persons

    difficult, unmanageable, hard to deal with; see irritable, obstinate, undesirable.

See impossible in Webster's New World Roget's A-Z Thesaurus II

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