one-sidedly

adverb2

1. •
   In a manner which physically favors or uses only one side of something.

   • The man smiled one-sidedly. — 1915
2. •
   In a one-sided or biased manner.

   • Macaulay was concerned to interpret the seventeenth century in terms of the triumph of the Whigs as champions of public rights; and he upheld this one-sidedly but not malignantly. — 1913