to make complex, intricate, involved, or difficult

His recovery from the operation was complicated by an allergic reaction.

complex; involved.

Entomology . folded longitudinally one or more times, as the wings of certain insects.

verb

disentangle , ease , explain , facilitate , make simple , untangle

verb

add fuel to fire , bedevil , clog , combine , confound , convolute , derange , disarrange , disorder , elaborate , embroil , entangle , fold , foul up * , handicap , impede , infold , interfuse , interrelate , interweave , involve , jumble , make intricate , make waves , mix up , muck up * , muddle , multiply , obscure , open can of worms , perplex , ravel , render unintelligible , screw up * , snafu * , snag , snarl up , tangle , twist , upset , embarrass , snarl , arduous , bewilder , confuse , embrangle , intricate , obfuscate , puzzle , troublesome