ruggedness

n [U].

ruddiness, ruddy, rude, rudely, rudeness, rudiment, rudimentary, rue, rueful, ruefully, ruefulness, ruff, ruffian, ruffle, rug, Rugby, Rugby League, Rugby Union, rugged, ruggedly, rugger, ruin, ruination, ruined, ruinous, rule, ruler, ruling, rum, rumba, rumble, rumbling, rumbustious, ruminant, ruminate, rumination, ruminative, ruminatively, rummage, rummage sale,