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Synonyms for Rugged (same or very similar meaning)

WordNet sense 1 (topographically very uneven):
broken

WordNet sense 2 (having or caused by an irregular surface):
rough, unsmooth

WordNet sense 3 (rocky and steep):
craggy

WordNet sense 4 ((of a shore or shoreline) characterized by steep cliffs or precipices):
clifflike, cliffy

WordNet sense 5 (not easy; requiring great physical or mental effort to accomplish or comprehend or endure):
difficult, hard

WordNet sense 6 (substantially made or constructed):
sturdy, tough

WordNet sense 7 (able to survive under unfavorable conditions):
hardy


From the ODE community, based on WordNetadd/edit