onerous
US /ˈɑː.nɚ.əs/
UK /ˈɑː.nɚ.əs/

1.
oneroso, pesado, difícil
involving a great deal of effort, trouble, or difficulty
:
•
The new regulations impose onerous burdens on small businesses.
As novas regulamentações impõem encargos onerosos às pequenas empresas.
•
He found the task to be quite onerous.
Ele achou a tarefa bastante onerosa.