tricky

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

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