Synonyms of the word

rock-ribbed

• adj. having rocky cliffs or outcroppings.
• adj. obstinately firm and unyielding in one's opinions.

clifflike

• adj. Resembling a cliff or some aspect of one; high and steep.

cliffy

• adj. Abounding in cliffs.

die-hard

• adj. Alternative spelling of diehard.
• n. Alternative spelling of diehard.

inflexible

• adj. Not flexible; not capable of bending or being bent; stiff; rigid; firm; unyielding.
• adj. Not willing to change, e.g. one's opinion or habits; obstinate; stubborn; resolute; determined.

rockbound

• adj. surrounded by rocks.