onerous

US /ˈɑː.nɚ.əs/
UK /ˈɑː.nɚ.əs/
"onerous" picture
1.

involving a great deal of effort, trouble, or difficulty

:
•
The new regulations impose onerous burdens on small businesses.
•
He found the task to be quite onerous.
:
burdensomearduoustaxingdemandingstrenuous
:
easylightsimple