thorny, vexing, ticklish, intractable, prickly, weighty, nettlesome, complicated, perplexing, irresolvable, touchy, delicate, tricky, convoluted, abstruse, unsolvable, contentious, unresolved, insolvable, untangled, tangled, unresolvable, tortuous, insoluble, messy, problematic, inscrutable, dicey, labyrinthine, intricate, peculiar, sticky, murky, recondite, ropy, arcane, fractious, neuralgic, resolvable, existential, obtuse, muddled, byzantine, daunting, esoteric, simultaneous equations, troublesome, multifarious, puzzling, tractable, philosophical, nuanced, festering, complex, nagging, longwinded, gnarled, hugger mugger, straightforward, snaky, unshapely, tangential, recalcitrant, unwieldy, pointillistic, discordant, intriguing, definitional, imponderable, piquant, tricksy, labyrinthian, solving, dissonant, irksome, legalistic, ambiguous, solvable, tangly, formless, myriad, ungainly, terminological, raveled, ponderous, baffling, gordian knot, unforthcoming, devilish, sinuous, quarrelsome, undecipherable, pettier, tactful, metaphysical, awkward, toothsome, dense, inharmonious, nabokovian, gossamer, problematical, gnarly, knobby, spindly, difficult, knobbly, stout, trickiest, forked, horny, limber, portant

blueberry root, blue cohosh, caulophyllum thalictrioides, caulophyllum thalictroides, papooseroot, papoose root, squawroot, varicose

crooked, hard, involved, knobbed, knotted