interminable
adjective
in·ter·mi·na·ble
| \ (ˌ)in-ˈtərm-nə-bəl
, -ˈtər-mə-\
, -ˈtər-mə-\
Definition of interminable
: having or seeming to have no end
especially
: wearisomely protracted
an interminable sermon