Synonyms for Hilly:

adj.

bumpy (adjective)
rangy, craggy, rolling, rugged, uneven, Undulating, sloping, steep, mountainous, rocky.
irregular (adjective)
irregular.
mountainous (adjective)
alpine, mountainous.
rolling (adjective)
Undulating.
rotating (adjective)
rolling.

n.

graded, gently, highland, gradual, gentle. bumpy (noun)
rangy, sloping, precipitous, uneven, rocky, Undulating, rugged, steep, abrupt, irregular, broken, rolling.
hilly (noun)
mountainous, craggy, unsmooth, rough, cragged.

Other synonyms:

graded, gradual, rugged, gently. highland, rolling. irregular, steep. Other relevant words:
abrupt, steep, sloping, graded, irregular, highland, precipitous, craggy, rough, rangy, uneven, broken, gently, rolling, cragged, gradual, rugged, unsmooth, Undulating, rocky.

Usage examples for hilly

  1. Just a hilly ridge. – A Letter of Credit by Susan Warner
  2. They kept along the hillside until they struck the track - for it could scarcely be called a road - leading from the village into the interior, and then boldly followed this; for the difficulty of travelling across the hilly and broken country was so great that they preferred to run the slight extra risk of keeping to the road, feeling certain that for the first day's march at least their appearance and the fish they carried would answer for themselves with any body of troops they might meet. – Bonnie Prince Charlie A Tale of Fontenoy and Culloden by G. A. Henty