Lingering

google

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Middle English (in the sense ‘dwell, abide’): frequentative of obsolete leng ‘prolong’, of Germanic origin; related to German längen ‘make long(er)’, also to long1.

wiktionary

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From linger +‎ -ing.

etymonline

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lingering (adj.)

"remaining long," 1540s, present-participle adjective from linger (v.). Related: Lingeringly.