Definition: Okay, here's a short, funny rhyme incorporating “harder” as defined – aiming for clever, light-hearted and slightly ridiculous:
(of material or fluid) Having a severe property; presenting difficulty.
My toast was stubbornly harder than stone,
I wrestled it with a frustrated groan.
Then I tried to butter it with a trombone,
A truly absurd and decidedly harder tone!
A truly absurd and decidedly harder tone!