From The Collaborative International Dictionary of English v.0.48:

Unthinking \Un*think"ing\, a.
   1. Not thinking; not heedful; thoughtless; inconsiderate; as,
      unthinking youth.
      [1913 Webster]

   2. Not indicating thought or reflection; thoughtless.
      [1913 Webster]

            With earnest eyes, and round unthinking face,
            He first the snuffbox opened, then the case. --Pope.
      [1913 Webster] -- Un*think"ing*ly, adv. --
      Un*think"ing*ness, n.
      [1913 Webster]
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