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Definition of rugged : 1. Full of asperities on the surface; broken into sharp or irregular points, or otherwise uneven; not smooth; rough; as, a rugged mountain; a rugged road.
2. Harsh; hard; crabbed; austere; - said of temper, character, and the like, or of persons.
3. Not neat or regular; uneven.
4. Rough to the ear; harsh; grating; - said of sound, style, and the like.
5. Rough with bristles or hair; shaggy.
6. Sour; surly; frowning; wrinkled; - said of looks, etc.
7. Stormy; turbulent; tempestuous; rude.
8. Vigorous; robust; hardy; - said of health, physique, etc.
9. Violent; rude; boisterrous; - said of conduct, manners, etc.

Synonyms:

wiped out, humiliated, calm, humbled, hard-handed, raging, impoverished, clifflike, toughened, ugly, mountainous, tempestuous, craggy, knockabout, violent, roiled, cragged, hard-bitten, cliffy, crushed, dirty, continue, broken in, unkept, ruffianly, scabrous, hale, elusive, heavy, furrowed, uneven, roily, bad, smooth, turbulent, healthy, hardy, tumultuous, sturdy, rough-and-tumble, unsmooth, hilly, ironbound, baffling, upset, problematic, low, wild, problematical, action, disordered, confused, broken, stormy, busted, strong

difficult (part of speech: adjective)

formidable, thorny, cumbersome, contrary, strenuous, arduous, knotty, demanding, harsh, oppressive, uphill, ticklish, tricky, finicky, hard, fussy, troublesome, difficult, wearing, tough, stressful, wearying, complicated, complex, cantankerous, tight, severe, burdensome, wearisome, grinding, adverse, toilsome, laborious, rough, onerous, trying, bothersome

rough (part of speech: adjective)

knurled, sinewy, bristly, ragged, ruffled, gnarled, stubbled, jagged, scuffed, rumpled, scratchy, coarse

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