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 WordNet
add/edit