- the original form of rock-'n'-roll, basically dependent on a consistently loud and strong beat.
- (loosely) of or relating to igneous or metamorphic rocks, as in mining (hard-rock mining ) and geology (hard-rock geology ).
- (of mining) concerned with extracting minerals other than coal, usually from solid rock
- a tough uncompromising man
- a rhythmically simple and usually highly amplified style of rock and roll
