hard
US /hɑːrd/
UK /hɑːrd/

1.
2.
difficult to do, understand, or deal with
:
•
It was a hard decision to make.
•
The exam was really hard.
1.
with a great deal of effort or intensity
:
•
He worked hard to finish the project on time.
•
It rained hard all night.
2.
with difficulty
:
•
He breathed hard after running the marathon.
•
She found it hard to believe his story.