The Collaborative International Dictionary of English v.0.48:

Honestly \Hon"est*ly\, adv.
   1. Honorably; becomingly; decently. [Obs.] --Chaucer.
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   2. In an honest manner; as, a contract honestly made; to live
      honestly; to speak honestly. --Shak.
      [1913 Webster]

   To come honestly by.
      (a) To get honestly.
      (b) A circumlocution for to inherit; as, to come honestly
          by a feature, a mental trait, a peculiarity.
          [1913 Webster]