1) Abounding in monticles 2) Cragged 3) Craggy 4) Elevated 5) Full of hills 6) Full of ups and downs 7) Good for sledding say 8) Good for tobogganing 9) Having grades 10) Having hills and crags 11) Having many hills 12) High 13) Hilly country 14) Late cbgb founder kristal 15) Like a challenging 10K course Found on https://www.crosswordclues.com/clue/hilly