undefinable (adjective) inexplicable: beyond comprehension, explanation
Sinonime: baffling,
enigmatic,
incomprehensible, indecipherable,
indescribable, inexplainable,
inscrutable, insoluble,
mysterious, mystifying,
obscure,
odd,
peculiar, puzzling,
strange, unaccountable, undefinable,
unexplainable,
unfathomable, unintelligible, unsolvable
Antonime: comprehendible, explainable, explicable,
intelligible