Granitic is an adjective that means hard like granite.

The Latin word granum (GRAH noom) refers to ‘grain.’ The word later drifted into Italian, then English and its meaning shifted to a reference to a very hard stone. Our word of the day is the adjective variation that can refer literally to anything composed of granite or metaphorically to anything or anyone that is firm and determined. Here’s an example of granitic used metaphorically:

Jimmy’s granitic will ensured that our band would succeed. We knew from the beginning that nothing would shatter his determination.