RichThesaurus
agonizingly
vs
unendurably
agonizingly
adv
In an agonizing manner; in a way that causes agony.
unendurably
adv
In an unendurable manner; intolerably.
How often have the words
agonizingly
and
unendurably
occurred in a corpus of books?
(source:
Google Ngram Viewer
)