Knotty

Adjective

 * 1) Full of knots.
 * knotty pine
 * 1) Complicated or tricky; complex; difficult.
 * a knotty problem

Thesaurus
Byzantine, Herculean, abstruse, arduous, beyond one, brutal, burled, complex, complicated, crabbed, cramp, critical, daedal, delicate, demanding, difficile, difficult, effortful, elaborate, exacting, formidable, garbled, gnarled, gnarly, gordian, hairy, hard, hard to understand, hard-earned, hard-fought, intricate, involved, jawbreaking, jumbled, knobbed, knobbly, knobby, knoblike, knotted, knurled, knurly, laborious, labyrinthine, lumpy, mean, no picnic, nodal, noded, nodiform, nodose, nodular, nodulated, noduled, not easy, nubbled, nubbly, nubby, obfuscated, obscure, obscured, operose, overtechnical, perplexed, rigorous, rough, rugged, scrambled, set with thorns, severe, sophisticated, spiny, steep, sticky, strenuous, studded, terrible, thorny, ticklish, toilsome, torose, tough, tricky, tubercular, tuberculous, tuberose, tuberous, uphill, wicked

Translations

 * Russian:


 * Russian: