trickier, touchy, knottiest, nettlesome, contentious, vexing, weightier, complicated, ticklish, problematic, prickly, murkier, dicey, unresolved, stickier, daunting, bigger, intractable, messier, vaguer, nuanced, problematical, subtler, graver, meatier, uglier, hairier, tougher, broader, hazier, hot potato, fuzzier, divisive, rougher, irresolvable, intriguing, starker, delicate, larger, controversial, cloudier, worthier, discussable, philosophical, darker, troublesome, solvable, unresolvable, simultaneous equations, germane, weirder, warier, testy, perplexing, insolvable, grander, deeper, clearer, riskier, unsolvable, odder, harder, straightforward, nastier, scarier, awkward, loftier, convoluted, pettier, sketchier, neuralgic, mundane, simpler, muddled, wider, lengthier, wordier, stumbling block, juicier, complex, tawdrier, blunter, sillier, grimmer, sticky wicket, chancier, unwieldy, definitional, abstruse, fractious, solving, ambivalent, cumbersome, shadier, sterner, festering, prosaic, debatable, friendlier, slighter, easier, esoteric, tricky, difficult, crucial, disputable, important, knotty, noncontroversial, portant, thorny, trickiest, trivial, unimportant, unsolved, challenging