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rugged 
1 broken, bumpy, craggy, difficult, irregular, jagged, ragged, rocky, rough, stark, uneven 
2 furrowed, leathery, lined, rough-hewn, strong-featured, weather-beaten, weathered, worn, wrinkled 
3 austere, crabbed, dour, gruff, hard, harsh, rough, rude, severe, sour, stern, surly 
4 barbarous, blunt, churlish, crude, graceless, rude, uncouth, uncultured, unpolished, unrefined 
5 arduous, demanding, difficult, exacting, hard, harsh, laborious, rigorous, stern, strenuous, taxing, tough, trying, uncompromising 
6 beefy  (informal) brawny, burly, hale, hardy, husky  (informal) muscular, robust, strong, sturdy, tough, vigorous, well-built 
 
Antonyms  
 
1 even, gentle, level, regular, smooth, unbroken 
2 delicate, pretty, refined, smooth, unmarked, youthful 
4 civil, courteous, cultivated, cultured, elegant, polished, polite, refined, sophisticated, subtle, urbane, well-bred 
5 agreeable, easy, gentle, mild, pleasant, simple, soft, tender, uncomplicated, unexacting 
6 delicate, feeble, fragile, frail, infirm, sickly, skinny, soft, weak