cliffy

adj

1. Abounding in cliffs.

   “1865, Henry David Thoreau, Cape Cod, Chapter IX. "The Sea and the Desert", page 176. There is naked Nature,—inhumanly sincere, wasting no thought on man, nibbling at the cliffy shore where gulls wheel amid the spray.”

   “Where did they all live? I wondered. My curiosity was soon destined to be gratified. Turning to the left the string of litters followed the cliffy sides of the crater for a distance of about half a mile, or perhaps a little less, and then halted.”

2. Characteristic of a cliff.

   “HAG [...] 1. A rock or cliff; an abrupt, cliffy prominence.”

noun

1. (slang)A cliffhanger (dramatic stopping point in a story).

   “All your questions won't be answered in the first book. It may end on a cliffhanger that leads into book 2. It's a mild cliffy, but it's there none the less.”