The Collaborative International Dictionary of English v.0.48:

Lowlily \Low"li*ly\, adv.
   In a lowly place or manner; humbly. [Obs. or R.]
   [1913 Webster]

         Thinking lowlily of himself and highly of those better
         than himself.                            --J. C.
                                                  Shairp.
   [1913 Webster]