All 4 Uses

endure
in
Cry, the Beloved Country
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He could not follow the turnings that they made under the high buildings, but at last, his arm tired beyond endurance by the bag, they came to a place of many buses.†
Chpt 1.4 *
And others say, can such fear be endured?†
Chpt 1.12
And the way in which he said, that comforted me, was to Father Vincent so unendurable, that he sat there rigid, almost without breathing, hoping that this would soon be finished.†
Chpt 1.15

unendurable = not capable of being suffered through (or put up with)

standard prefix: The prefix "un-" in unendurable means not and reverses the meaning of endurable. This is the same pattern you see in words like unhappy, unknown, and unlucky.
The morning was already hot beyond endurance, but the skies were cloudless and held no sign of rain.†
Chpt 3.31

Definitions:

(1) (endure as in: endured the pain)
to suffer through (or put up with something difficult or unpleasant)
(2) (endure as in: endure through the ages)
to continue to exist
(3) (meaning too rare to warrant focus)