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]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "illiberal":
   authoritarian, avaricious, biased, bigot, bigoted, borne,
   chauvinist, cheap, close, closed, closefisted, constricted,
   cramped, creedbound, deaf, deaf to reason, doctrinaire, dogmatist,
   fanatic, fanatical, grudging, hardfisted, hidebound, insular,
   intolerant, jaundiced, jingo, little, little-minded,
   male chauvinist, mean, mean-minded, mean-spirited, mingy, miserly,
   narrow, narrow-hearted, narrow-minded, narrow-souled,
   narrow-spirited, near, nearsighted, niggardly, one-sided,
   opinionated, paltry, parochial, partial, partisan, penny-pinching,
   petty, pig, pinchfisted, pinching, prejudiced, provincial,
   purblind, racist, rigid, rigorous, save-all, sexist, shortsighted,
   small, small-minded, stingy, straitlaced, stringent, stuffy,
   superpatriot, tight, tightfisted, ultranationalist, uncatholic,
   uncharitable, unchivalrous, ungenerous, unliberal