interminable
adjective
in·ter·mi·na·ble
(ˌ)in-ˈtər-mə-nə-bəl
-ˈtərm-nə-
: having or seeming to have no end
especially
: wearisomely protracted
an interminable sermon
interminableness
noun
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Merriam-Webster unabridged
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