eth·i·cal·ly /ˈɛθɪk(ə)lɪ/ 副詞
  Eth·ic·al·ly, adv. According to, in harmony with, moral principles or character.
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  ethically
       adv : in an ethical manner; from an ethical point of view;
             according to ethics; "he behaved ethically"; "this is
             ethically unacceptable" [ant: unethically]