Byzantine, Daedalian, Herculean, abstruse, amalgamated, ambiguous, ambivalent, amphibious, anfractuous, arduous, baffling, balled up, bewildering, beyond one, blended, bothering, brutal, combined, complex, complicated, composite, compound, compounded, confounded, confounding, confused, confusing, conglomerate, convoluted, crabbed, cramp, critical, daedal, dappled, dedal, delicate, demanding, devious, difficile, difficult, discomposing, disconcerting, dismaying, distracting, disturbing, eclectic, elaborate, embarrassing, embrangled, enigmatic, entangled, equivocal, exacting, fancy, fifty-fifty, formidable, fouled up, garbled, gordian, hairy, half-and-half, hard, hard to understand, hard-earned, hard-fought, heterogeneous, implicated, indiscriminate, involuted, involved, ironic, jawbreaking, jumbled, knotted, knotty, laborious, labyrinthian, labyrinthine, loused up, many-faceted, many-sided, matted, mazy, mean, meandering, medley, messed up, mingled, miscellaneous, mixed, mixed up, motley, mucked up, multifaceted, multifarious, multinational, multiracial, mysterious, mystifying, no picnic, not easy, obfuscated, obscure, obscured, operose, ornate, overtechnical, patchy, perplexed, perplexing, perturbing, pluralistic, problematic, promiscuous, puzzling, ramified, rigorous, rococo, rough, roundabout, rugged, scrambled, screwed up, set with thorns, severe, sinuous, snarled, sophisticated, spiny, steep, strenuous, subtle, syncretic, tangled, tangly, thorny, thrown together, ticklish, toilsome, tortuous, tough, tricky, twisted, uphill, upsetting, varied, wicked, winding