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Webster 1828 Edition

adv.

Unreasonably; in a manner or degree that conscience and reason do not justify.

unconscionably ‎(comparative more unconscionably, superlative most unconscionably)

In an unconscionable manner.
- 1918, W. B. Maxwell, chapter 13, in The Mirror and the Lamp:
  “[…] They talk of you as if you were Croesus—and I expect the beggars sponge on you unconscionably.” And Vickers launched forth into a tirade very different from his platform utterances. He spoke with extreme contempt of the dense stupidity exhibited on all occasions by the working classes.