もつれる (translations)→ cross ravel slur
ややこしい (translations)→ bad complex complicating confuse confused painstaking
手のこんだ (translations)→ devious practical
難解な (translations)→ abstruse confusing difficult enigmatic esoteric hermetic rarefied
複雑な (translations)→ byzantine complexity convoluted elaborate intricate involved labyrinthine mixed thorny tortuous