adjective, hillier, hilliest.
full of hills; having many hills; hilly country.
resembling a hill; elevated; steep.

1350–1400; Middle English; Old English hyllīc. See hill, -y1

hilliness, noun
unhilly, adjective
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World English Dictionary
hill (hɪl)
1.  a.  a conspicuous and often rounded natural elevation of the earth's surface, less high or craggy than a mountain
 b.  (in combination): a hillside; a hilltop
2.  a.  a heap or mound made by a person or animal
 b.  (in combination): a dunghill
3.  an incline; slope
4.  over the hill
 a.  informal beyond one's prime
 b.  slang military absent without leave or deserting
5.  up hill and down dale strenuously and persistently
6.  to form into a hill or mound
7.  to cover or surround with a mound or heap of earth
[Old English hyll; related to Old Frisian holla head, Latin collis hill, Low German hull hill]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Peninsulas or a hilly landscape can act as natural barrier and help to defend
  the city against enemies.
Of course, taking gears out of the picture can make riding a lot less fun, if
  not downright miserable for those in hilly areas.
Hill hold feature takes the stress out of manual shifting during hilly city
Buildings and hilly terrain allow overhead shots and pans that take in a whole
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