Source : Webster's Revised Unabridged Dictionary (1913)

Unchristianly \Un*chris"tian*ly\, a.
   Unchristian. --Milton.

Unchristianly \Un*chris"tian*ly\, adv.
   In an unchristian manner.

Source : WordNet®

unchristianly
     adj : not becoming to or like a Christian; "ashamed to have to
           recognize how unchristianly his assumptions and motives
           are" [syn: {unchristlike}]