1867, "not reconciled to the outcome of the American Civil War," from un- (1) "not" + past participle of reconstruct (v.). See Reconstruction.
there are probably more unreconstructed Southerners than one would like to admit
peasants are still unreconstructed small capitalists at heart
unreality
unreason
unreasonable
unrecognizable
unreconciled
unreconstructed
unrecorded
unredeemed
unrefined
unreformed
unregenerate