grueling

US /ˈɡruː.ə.lɪŋ/
UK /ˈɡruː.ə.lɪŋ/
"grueling" picture
1.

extremely tiring and demanding

:
•
The marathon was a grueling test of endurance.
•
She underwent a grueling training regimen for the competition.
:
arduousstrenuousexhaustingtaxingdemanding