Synonyms of the word 
ROCKBOUND → CLIFFLIKE - CLIFFY - ROCK-RIBBED
rockbound
- adj. surrounded by rocks.
clifflike
- adj. Resembling a cliff or some aspect of one; high and steep.
cliffy
- adj. Abounding in cliffs.
rock-ribbed
- adj. having rocky cliffs or outcroppings.
- adj. obstinately firm and unyielding in one's opinions.
If you are interested in words, visit the following sites :
- wiktionary.org/rockbound For complete definition of a word
- 1word.ws/rockbound to play with words, suffixs, prefixs, etc.