impossible

noun 0.863

improbability

noun 0.756

impracticability

noun 0.727

impracticality

noun 0.716

undoable

noun 0.714

unfeasibility

noun 0.703

infeasibility

noun 0.695

implausibility

noun 0.693

inability

noun 0.689

inconceivability

noun 0.689

impassibility

noun 0.655

possibility

noun 0.645

unobtainable

noun 0.643

impermissibility

noun 0.640

incapability

noun 0.640

mission impossible

noun 0.638

unlikeliness

noun 0.627

inevitability

noun 0.627

inaccessibility

noun 0.623

nonexistence

noun 0.622

unlikelihood

noun 0.621

unsolvability

noun 0.618

inexistence

noun 0.614

unavoidability

noun 0.612

unsatisfiability

noun 0.609

unattainable

noun 0.601

impermeability

noun 0.601

inimitability

noun 0.597

inevitableness

noun 0.597

nonviability

noun 0.596

impregnability

noun 0.595

impenetrability

noun 0.588

unenforceability

noun 0.588

implacability

noun 0.586

unknowability

noun 0.585

invincibility

noun 0.585

unacceptability

noun 0.583

incredibility

noun 0.583

incompatibility

noun 0.582

unavailability

noun 0.580

inapplicability

noun 0.580

incomparability

noun 0.576

nonavailability

noun 0.575

incapacity

noun 0.574

irreversibility

noun 0.572

inexorability

noun 0.571

impeccability

noun 0.570

insolubility

noun 0.568

ignorability

noun 0.568

unreality

noun 0.566

hopelessness

noun 0.566

nonoccurrence

noun 0.566

incomprehensibility

noun 0.565

intangibility

noun 0.565

unworkable

noun 0.565

imperfection

noun 0.565

impotence

noun 0.564

inaccessible

noun 0.564

negative capability

noun 0.562

unreachable

noun 0.562

imperceptibility

noun 0.561

impotency

noun 0.559

irresistibility

noun 0.557

impediment

noun 0.556

futility

noun 0.556

undeniability

noun 0.555

unapproachability

noun 0.555

immovability

noun 0.553

possible

noun 0.551

irreconcilability

noun 0.551

illegality

noun 0.551

passibility

noun 0.549

imperfectness

noun 0.549

immutability

noun 0.548

immateriality

noun 0.546

limitedness

noun 0.546

unpredictability

noun 0.545

inadmissibility

noun 0.544

imperviousness

noun 0.543

absurdity

noun 0.543

incompatible

noun 0.540

indispensability

noun 0.539

invalidity

noun 0.538

conceivability

noun 0.538

indissolubility

noun 0.538

uselessness

noun 0.537

nonfunctionality

noun 0.537

invisibility

noun 0.537

unreasonableness

noun 0.536

infallibility

noun 0.536

imperishability

noun 0.536

incompleteness

noun 0.536

impuissance

noun 0.535

unspeakability

noun 0.535

incorrigibility

noun 0.533

illogicality

noun 0.532

ungovernability

noun 0.532

imagination

noun 0.531

impasse

noun 0.531

voidability

noun 0.531