longingly

from WordNet (r) 3.0 (2006)

longingly
    adv 1: in a yearning manner; "he spent the rest of the act
           gazing longingly over my right shoulder at the
           illuminated word `Exit'" [syn: {longingly}, {yearningly}]

from The Collaborative International Dictionary of English v.0.48

Longingly \Long"ing*ly\, adv.
   With longing. --Dryden.
   [1913 Webster]