rockbound (adj.)
- corrugated
- cragged
- craggy
- crinkled
- crumpled
- dour
- firm
- fundamentalist
- gravelly
- hard
- harsh
- hidebound
- inexorable
- inflexible
- iron
- ironclad
- jagged
- jaggy
- muscle-bound
- obdurate
- obstinate
- orthodox
- procrustean
- puritanic
- ragged
- relentless
- rigid
- rigorous
- rocky
- rugged
- rugose
- saw-toothed
- scraggly
- scraggy
- serrate
- serrated
- stiff
- stony
- straightlaced
- straitlaced
- stubborn
- unbending
- uncompromising
- unrelenting
- unyielding
- wrinkled
