tough proposition

arduous challenging intimidating onerous powerful tough tremendous

all-powerful ballbuster colossal effortful hard labored laborious mighty overpowering puissant rough staggering strenuous toilsome uphill

easy facile ineffective insignificant little small unimportant weak

feeble friendly harmless not hard trivial

complexity conundrum dilemma enigma mystery puzzle quandary teaser

bewilderment charade complication confusion cryptogram distraction doubt embarrassment entanglement intricacy labyrinth maze mystification perplexity plight poser predicament problem puzzlement question rebus stickler strait stumper twister

brain-twister closed book knotty question mind-boggler sixty-four dollar question tough nut to crack

solution

confidence good fortune simplicity