δύσκολος

Etymology
Apparently a formation from + a component  of unknown meaning and origin.

Adjective

 * 1) bad-tempered, irritable, peevish, grouchy, cantankerous
 * 2) unpleasant, annoying
 * 3) difficult, troublesome

Etymology
From, from +.

Adjective

 * 1)  difficult, hard, tough, arduous not easy, requiring much effort
 * 2)  refractory difficult to treat
 * 3)  difficult, uncooperative, troublesome hard to manage
 * 1)  refractory difficult to treat
 * 2)  difficult, uncooperative, troublesome hard to manage
 * 1)  difficult, uncooperative, troublesome hard to manage