too deep (adjective) unfathomable: hard to believe; difficult to understand
Sinonime: abstruse, baffling, clear as mud,
deep,
enigmatic,
esoteric,
heavy,
impenetrable, incognizable,
incomprehensible, indecipherable,
inexplicable,
obscure,
profound, too deep, uncomprehensible, ungraspable, unintelligible, unknowable
Antonime: believable,
comprehensible, fathomable