资料来源 : pyDict

枉然的,无益地,徒然

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Vainly \Vain"ly\, adv.
   In a vain manner; in vain.

资料来源 : WordNet®

vainly
     adv : to no avail; "he looked for her in vain"; "the city fathers
           tried vainly to find a solution" [syn: {in vain}]