The Collaborative International Dictionary of English v.0.48:

Illiberal \Il*lib"er*al\, a. [L. illiberalis; pref. il- not +
   liberalis liberal: cf. F. illib['e]ral.]
   1. Not liberal; not free or generous; close; niggardly; mean;
      sordid. "A thrifty and illiberal hand." --Mason.
      [1913 Webster]

   2. Indicating a lack of breeding, culture, and the like;
      ignoble; rude; narrow-minded; disingenuous.
      [1913 Webster]

   3. Not well authorized or elegant; as, illiberal words in
      Latin. [R.] --Chesterfield.
      [1913 Webster]

WordNet (r) 3.0 (2006):

illiberal
    adj 1: narrow-minded about cherished opinions [syn: illiberal,
           intolerant]