No sooner had we finished working on one tough problem than the president sent us yet another straight from the top. ✬

Donkeys are tough animals. ✬

You're tough. ✬

It was tough to finish the work. ✬

The meat is tough. ✬

This steak is too tough. ✬

You're usually as tough as nails. ✬

He gets tough at times. ✬

She's a tough woman. ✬

Today was a very tough day. ✬