unfathomable
adjective
[ ʌnˈfað(ə)məb(ə)l ]
• incapable of being fully explored or understood.
• "her grey eyes were dark with some unfathomable emotion"
Similar:
inscrutable,
incomprehensible,
enigmatic,
incalculable,
indecipherable,
obscure,
esoteric,
abstruse,
puzzling,
cryptic,
mysterious,
mystifying,
baffling,
deep,
profound,
secretive,
• (of water or a natural feature) impossible to measure the extent of.
• "mountains of unfathomable scale"
