adjective
complicated, difficult
Synonyms: catchy, complex, critical, delicate, intricate, involved, knotty, perplexing, precarious, problematic, quirky, risky, rocky, sensitive, sticky, thorny, ticklish, touch-and-go, touchy, undependable, unstable
Antonyms: easy, uncomplicated
adjective
deceptive, sly
Synonyms: artful, astute, cagey, catchy, clever, crafty, cunning, deceitful, deep, delusive, delusory, devious, dishonest, foxy, greasy, guileful, insidious, intelligent, keen, misleading, scheming, shady, sharp, shifty, shrewd, slick, slippery, smooth, streetwise, subtle, treacherous, wily, witted, wry
Antonyms: aboveboard, frank, honest