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Undoable
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Thesaurus
complex
complicated
crabbed
cramp
difficult
garbled
hard
hard to understand
impracticable
impractical
inoperable
insuperable
insurmountable
intricate
jumbled
knotty
obfuscated
obscure
obscured
overtechnical
perplexed
scrambled
too much for
tough
unachievable
unattainable
uncompassable
undoable
uneffectible
unnegotiable
unperformable
unrealizable
unsurmountable
unworkable
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