impassible

adj 0.967

unpassable

adj 0.934

insurmountable

adj 0.727

insuperable

adj 0.721

impenetrable

adj 0.715

unbridgeable

adj 0.710

inaccessible

adj 0.710

impermeable

adj 0.702

impossible

adj 0.689

unnavigable

adj 0.686

impregnable

adj 0.684

impervious

adj 0.683

undoable

adj 0.680

unapproachable

adj 0.671

unreachable

adj 0.662

nonpermeable

adj 0.651

inoperable

adj 0.649

impracticable

adj 0.647

inescapable

adj 0.643

inexpugnable

adj 0.637

intractable

adj 0.635

insolvable

adj 0.633

infeasible

adj 0.631

unachievable

adj 0.628

unobtainable

adj 0.620

unmasterable

adj 0.619

unplayable

adj 0.617

unattainable

adj 0.615

imposable

adj 0.613

unpayable

adj 0.611

unconquerable

adj 0.608

unwinnable

adj 0.606

impassive

adj 0.605

unworkable

adj 0.604

unmovable

adj 0.604

unchallengeable

adj 0.603

inexpressible

adj 0.602

unassailable

adj 0.600

untractable

adj 0.600

unsearchable

adj 0.599

unthinkable

adj 0.599

incapable

adj 0.598

unable

adj 0.596

uneatable

adj 0.595

uncatchable

adj 0.595

irresoluble

adj 0.595

irresolvable

adj 0.593

insoluble

adj 0.592

imperforate

adj 0.592

unstoppable

adj 0.592

immovable

adj 0.591

unamendable

adj 0.591

unresectable

adj 0.590

unresolvable

adj 0.590

implacable

adj 0.589

unanswerable

adj 0.589

intolerable

adj 0.588

uncuttable

adj 0.588

unbeatable

adj 0.587

unbuildable

adj 0.586

inexorable

adj 0.586

incompossible

adj 0.586

incomprehensible

adj 0.584

imped

adj 0.584

impalpable

adj 0.584

insupportable

adj 0.583

unmoveable

adj 0.583

unimprovable

adj 0.582

utterable

adj 0.581

unavoidable

adj 0.581

inextricable

adj 0.580

unrecoverable

adj 0.577

inadmissible

adj 0.577

inviable

adj 0.577

uninhabitable

adj 0.576

unfixable

adj 0.576

nonresectable

adj 0.576

irreconcilable

adj 0.575

irrigable

adj 0.575

undevelopable

adj 0.574

impermissible

adj 0.574

unfinishable

adj 0.574

unusable

adj 0.574

unutterable

adj 0.573

unimpeded

adj 0.573

unfeasible

adj 0.572

out of the question

adj 0.571

immeasurable

adj 0.571

irremediable

adj 0.570

unhittable

adj 0.570

insufferable

adj 0.569

untellable

adj 0.569

inconceivable

adj 0.569

indefensible

adj 0.568

unappealable

adj 0.568

undefeatable

adj 0.568

unendurable

adj 0.568

unfordable

adj 0.568

irremovable

adj 0.568

incomputable

adj 0.567