excruciating

excruciating /ɪkˈskruːʃiˌeɪtɪŋ/ adjective
excruciating
/ɪkˈskruːʃiˌeɪtɪŋ/
adjective
Britannica Dictionary definition of EXCRUCIATING
[more excruciating; most excruciating]
1 
: very painful : causing great mental or physical pain
2 
b  : extreme or excessive

— excruciatingly

adverb