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

Disinterestedly \Dis*in"ter*est*ed*ly\, adv.
   In a disinterested manner; without bias or prejudice.

资料来源 : WordNet®

disinterestedly
     adv : without selfish motives; "he decided the case
           disinterestedly" [syn: {without bias}]