Synonyms for Lingering:

adj.

chronic (adjective)
abiding, prolonged, persisting, lasting, persistent, enduring, protracted, continuing.
long (adjective)
protracted, long-drawn-out.
slow (adjective)
lethargic, phlegmatic, plodding, slow, sluggish, dragging, creeping, Trudging, leisurely, dawdling, poky, Loitering, slowpoke, Delaying, crawling.

n.

forever, everlasting, chronic, protracted, persistent, lengthy, day in day out, prolonged, long, continue, long-drawn-out, interminable. act (noun)
tarriance.
lingering (noun)
tarriance, unforgettable.
slowness (noun)
lethargy, retardation, leisureliness, sluggishness, slowness.

v.

abiding (verb)
persevering, persisting, remaining, Experiencing, Tolerating, enduring, bearing, putting up with, lasting, continuing, suffering, going on, Tarrying, Undergoing, abiding.
procrastinating (verb)
Filibustering, Dallying, dilly-dallying, stalling, Procrastinating, hesitating, vacillating.
remaining (verb)
waiting, prevailing, Staying.
slowing (verb)
hindering, slowing, Retarding, poking.

Other synonyms:

interminable, protracted, long-drawn-out, lengthy. long, forever, prolonged. everlasting. persistent. inveterate
chronic.
Other relevant words:
interminable, lengthy, long, chronic, everlasting, protracted, prolonged, tarriance, persistent, forever, continue, long-drawn-out, unforgettable.

Usage examples for lingering

  1. His eye turned to the beautiful prospect lying at his feet, upon which the last purple rays of the evening sun were now lingering – Berlin and Sans-Souci by Louise Muhlbach
  2. If it had not been for a little lingering fever, he said, he would have gone much sooner. – The Flight of the Shadow by George MacDonald
  3. Very soon you will have something much more important to do than lingering around the world you have left. – From Whose Bourne by Robert Barr