1. I was so tired after running the marathon that I
could hardly move.
2. I couldn't eat that piece of cake you left for me it
was too hard. How many days old was it?
3. She's a hard worker and she'll go very far in this
company if she wants to.
4. We had hardly finished our meal when the waiter
told us they were closing and we had to leave.

Hard - duro, difícil, rígido (difficult, solid)
Hardly - apenas, escasamente (only just, scarcely)