inconnu

noun 0.570

something

noun 0.548

indefinable

noun 0.546

undefinable

noun 0.539

unquantifiable

noun 0.539

unknown

noun 0.538

unknowable

noun 0.530

something or other

noun 0.527

savoir-faire

noun 0.526

que

noun 0.525

nothing

noun 0.521

mystique

noun 0.521

jamais vu

noun 0.519

what

noun 0.518

anything

noun 0.507

incertitude

noun 0.507

imponderable

noun 0.502

dunno

noun 0.500