amateurishly

from WordNet (r) 3.0 (2006)

amateurishly
    adv 1: in an amateurish manner; "he performed the piece
           amateurishly" [ant: {expertly}, {like an expert}]

from The Collaborative International Dictionary of English v.0.48

Amateurish \Am`a*teur"ish\, a.
   In the style of an amateur; superficial or defective like the
   work of an amateur. -- {Am`a*teur"ish*ly}, adv. --
   {Am`a*teur"ish*ness}, n.
   [1913 Webster]