also British agonising /ˈægəˌnaɪzɪŋ/
Learner's definition of AGONIZING
[more agonizing; most agonizing]
: very mentally or physically painful
a long and agonizing battle with cancer
She made the agonizing decision to cancel the trip.
The agonizing wait was finally over.
He was in agonizing pain.
— agonizinglyalso Britishagonisinglyadverb