Source : Webster's Revised Unabridged Dictionary (1913)

Lingeringly \Lin"ger*ing*ly\, adv.
   With delay; slowly; tediously.

Source : WordNet®

lingeringly
     adv : in a slow, leisurely or prolonged way; "her voice was swift,
           yet ever the last words fell lingeringly" -Rossetti
           [syn: {protractedly}]