The Collaborative International Dictionary of English v.0.48:

Babish \Bab"ish\, a.
   Like a babe; a childish; babyish. [R.] "Babish imbecility."
   --Drayton. -- Bab"ish*ly, adv. -- Bab"ish*ness, n. [R.]
   [1913 Webster] Babism