Unbearable is a related term of agonising.
As an adjective unbearable
is so unpleasant or painful as to be unendurable.
As a verb agonising is
.
As a noun agonising is
.
unbearable
English
Adjective
(
en adjective)
so unpleasant or painful as to be unendurable
Synonyms
* insufferable
* unsupportable