Source : Webster's Revised Unabridged Dictionary (1913)

Jealously \Jeal"ous*ly\, adv.
   In a jealous manner.

Source : WordNet®

jealously
     adv 1: with jealousy; "he guarded his privacy jealously"
     2: with jealousy; in an envious manner; "he looked at his
        friend's new car jealously" [syn: {enviously}, {covetously}]