impassable

adj 0.934

impassible

adj 0.893

unbridgeable

adj 0.731

insurmountable

adj 0.714

insuperable

adj 0.707

unnavigable

adj 0.701

undoable

adj 0.679

inaccessible

adj 0.676

unreachable

adj 0.675

impenetrable

adj 0.673

unapproachable

adj 0.669

impermeable

adj 0.667

unplayable

adj 0.651

unpayable

adj 0.651

impossible

adj 0.648

unachievable

adj 0.641

nonpermeable

adj 0.638

impregnable

adj 0.636

unmasterable

adj 0.635

inescapable

adj 0.630

uneatable

adj 0.629

inoperable

adj 0.629

uncatchable

adj 0.624

unwinnable

adj 0.624

impervious

adj 0.623

unobtainable

adj 0.621

unchallengeable

adj 0.617

uncuttable

adj 0.617

unattainable

adj 0.614

unfinishable

adj 0.613

inexpugnable

adj 0.613

infeasible

adj 0.611

unbuildable

adj 0.611

unthinkable

adj 0.609

unsearchable

adj 0.609

unresolvable

adj 0.608

unworkable

adj 0.608

unusable

adj 0.608

unamendable

adj 0.608

unstoppable

adj 0.607

insolvable

adj 0.606

unrecoverable

adj 0.603

impracticable

adj 0.603

unpardonable

adj 0.603

unsellable

adj 0.600

unfixable

adj 0.600

unresectable

adj 0.600

unconquerable

adj 0.600

unutterable

adj 0.598

unhittable

adj 0.597

undevelopable

adj 0.596

unavoidable

adj 0.596

unable

adj 0.595

unmovable

adj 0.594

utterable

adj 0.593

unbeatable

adj 0.593

unsayable

adj 0.592

untellable

adj 0.592

insupportable

adj 0.592

unserviceable

adj 0.591

intractable

adj 0.591

unendurable

adj 0.591

unassailable

adj 0.590

unwearable

adj 0.589

unfordable

adj 0.589

intolerable

adj 0.589

undrinkable

adj 0.588

unassimilable

adj 0.588

nonresectable

adj 0.586

untractable

adj 0.586

unprintable

adj 0.586

uninhabitable

adj 0.586

inadmissible

adj 0.586

undeliverable

adj 0.585

untranslatable

adj 0.584

uncheckable

adj 0.584

unappealable

adj 0.583

unanswerable

adj 0.583

unlivable

adj 0.582

unamenable

adj 0.581

irresoluble

adj 0.581

irresolvable

adj 0.581

unspeakable

adj 0.580

unguessable

adj 0.580

unadoptable

adj 0.580

unbearable

adj 0.579

inviable

adj 0.579

unimprovable

adj 0.579

incompossible

adj 0.578

undefeatable

adj 0.577

inexpressible

adj 0.577

unrealizable

adj 0.577

imposable

adj 0.577

impermissible

adj 0.576

unsalvageable

adj 0.575

untameable

adj 0.575

unacceptable

adj 0.573

unmoveable

adj 0.573

unsalable

adj 0.572

out of the question

adj 0.572