insoluble

adjectives

(of a substance) incapable of being dissolved
indissoluble, insoluble
is derived from
insolubility
antonym
soluble
admitting of no solution or explanation
"an insoluble doubt"
insoluble
is derived from
insolubility
antonym
soluble
is similar to
not easily solved
"an apparantly insolvable problem"; "public finance...had long presented problems unsolvable or at least unsolved"- C.L.Jones
insolvable, unresolvable, unsoluble, unsolvable
see also
incapable of being explained or accounted for
"inexplicable errors"; "left the house at three in the morning for inexplicable reasons"
incomprehensible, inexplicable
without hope of solution
"an insoluble problem"
insoluble
is derived from
insolubility
is similar to
without hope because there seems to be no possibility of comfort or success
"in an agony of hopeless grief"; "with a hopeless sigh he sat down"
hopeless