unfathomable
- adjective (adj)
Meaning: hard to believe difficult to understand
Synonyms:
abstruse
baffling
clear as mud
deep
enigmatic
esoteric
heavy
impenetrable
incognizable
incomprehensible
indecipherable
inexplicable
obscure
profound
too deep
uncomprehensible
ungraspable
unintelligible
unknowable
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.