The Collaborative International Dictionary of English v.0.48:

Sycophantish \Syc"o*phant`ish\, a.
   Like a sycophant; obsequiously flattering. --
   Syc"o*phant`ish*ly, adv.
   [1913 Webster]

         Sycophantish satirists that forever humor the
         prevailing folly.                        --De Quincey.
   [1913 Webster]