I.
See main entry: ↑ agonize
II. ag ‧ o ‧ niz ‧ ing BrE AmE ( also agonising British English ) /ˈæɡənaɪzɪŋ/ adjective
1 . extremely painful:
The pain was agonizing.
2 . very unpleasant to experience, especially because of involving a difficult choice or a long wait:
an agonizing decision
—agonizingly adverb :
at an agonizingly slow pace