Synonyms of 'lingering'
slowDictionary, prolonged, protracted
He died a lingering death in hospital.
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over-prolonged or extended
a long-drawn-out election campaign
Something, usually something unpleasant, that is protracted lasts a long time, especially longer than usual or longer than you hoped.
The struggle was bitter and protracted.
Thesaurus for lingering from the Collins English Thesaurus