The Collaborative International Dictionary of English v.0.48:

donnish \donnish\ adj.
   like a university don; marked by a narrow focus on or display
   of learning, especially its trivial aspects.

   Syn: academic, pedantic, bookish.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

donnish
    adj 1: marked by a narrow focus on or display of learning
           especially its trivial aspects [syn: academic,
           donnish, pedantic]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "donnish":
   academic, bibliophagic, bluestocking, book-fed, book-learned,
   book-loving, book-minded, book-read, book-wise, bookish, booky,
   devoted to studies, diligent, dryasdust, inkhorn, literary,
   mandarin, owlish, pedagogic, pedantic, preceptorial, professorial,
   professorlike, rabbinic, scholarly, scholastic, schoolmastering,
   schoolmasterish, schoolmasterlike, schoolmasterly, schoolmistressy,
   schoolteacherish, schoolteachery, studious, teacherish,
   teacherlike, teachery, teachy, tutorial