excruciatingly

US /ɪkˈskruː.ʃi.eɪ.t̬ɪŋ.li/
UK /ɪkˈskruː.ʃi.eɪ.t̬ɪŋ.li/
1.

một cách đau đớn

in a way that is extreme and difficult to bear:

:
•
Progress has been excruciatingly slow.