KENNY from South Park is pretty steadfast - he keeps getting killed and coming back.
The vassal's crotch is as solid as the earth whenever the master's wife walks by.
unlike the other 2 かたいs, this one is FIGURATIVE : hard as in a steadfast, Sam Gamgee-ass pal. certain, reliable, solid. But 堅い also has a bad meaning: too stuffy, formal, rigid and bound by tradition
I pull the STRING until it's very tense.
You oversee the PLATE (you're a waiter)
The EARTH is very solid.
You gotta be clever to get MONEY.
You view things by LOOKING at them, dumbass.