The Collaborative International Dictionary of English v.0.48:
Vainly \Vain"ly\, adv. In a vain manner; in vain. [1913 Webster]WordNet (r) 3.0 (2006):
vainly adv 1: to no avail; "he looked for her in vain"; "the city fathers tried vainly to find a solution" [syn: vainly, in vain]