Lingering, a.
1. Delaying.
2. Drawn out in time; remaining long; protracted; as, a lingering disease. To die is the fate of man; but to die with lingering anguish is generally his folly. Rambler.
Shades of meaning
Fernald has no entry of its own for lingering; he lists it under slow.
He lists it without comment; the entries above explain its neighbors.