incognitum

noun 0.820

unknown

noun 0.671

inconnu

noun 0.666

terra incognita

noun 0.660

unknowable

noun 0.636

enigma

noun 0.624

unknowing

noun 0.605

imponderable

noun 0.605

incognito

noun 0.604

mystery

noun 0.588

incog

noun 0.586

unknowability

noun 0.585

unfamiliar

noun 0.581

indefinable

noun 0.581

undefinable

noun 0.579

indeterminate

noun 0.574

indeterminant

noun 0.572

ignoramus

noun 0.569

obscurity

noun 0.568

unknowingness

noun 0.566

hidden variable

noun 0.564

inscrutable

noun 0.562

incertitude

noun 0.561

indefinite

noun 0.560

indeterminable

noun 0.555

unseen

noun 0.552

indiscernible

noun 0.550

uncertainty

noun 0.549

incomprehensible

noun 0.544

indetermination

noun 0.544

unquantifiable

noun 0.543

inedita

noun 0.536

indeterminacy

noun 0.536

inscrutability

noun 0.532

ignorability

noun 0.525

problema

noun 0.525

question mark

noun 0.523

unfamiliarity

noun 0.522

intangible

noun 0.520

indeterminateness

noun 0.520

mysteriousness

noun 0.519

open problem

noun 0.518

unpredictable

noun 0.518

invisibility

noun 0.517

conundrum

noun 0.515

occult

noun 0.514

undecided

noun 0.513

ambigu

noun 0.512

equivoque

noun 0.512

anonym

noun 0.511

mysterium

noun 0.510

vague

noun 0.509

unsureness

noun 0.507

ambiguity

noun 0.507

unanswerable

noun 0.507

unthought

noun 0.507

ignorance

noun 0.506

incomprehension

noun 0.506

equivocal

noun 0.505

unforeseen

noun 0.504

no-name

noun 0.504

ignorant

noun 0.503

indiscernibility

noun 0.503

unconscious

noun 0.503

problemo

noun 0.503

recondite

noun 0.502