ruggedest
rug-ged-est
adjective
Possessing the greatest degree of roughness, strength, or unevenness.
"It was the ruggedest terrain we had ever crossed."
Thesaurus
Synonyms: unsmooth, rugged, rough, broken, sturdy, tough, knockabout, difficult, hard, rutted, corrugated, furrowed
Antonyms: delicate, unfurrowed