complex
Byzantine
Daedalian
Herculean
abstruse
amalgamated
ambiguous
ambivalent
amphibious
anfractuous
arduous
baffling
balled up
bewildering
beyond one
blended
bothering
brutal
combined
complicate
complicated
composite
compound
compounded
confounded
confounding
confused
confusing
conglomerate
convoluted
crabbed
cramp
critical
daedal
dappled
dedal
delicate
demanding
devious
difficile
difficult
discomposing
disconcerting
dismaying
distracting
disturbing
eclectic
elaborate
intricated
bizarre
costly
fascinate
ingenious
obscure
precise
sophisticated