The Collaborative International Dictionary of English v.0.48:

Scrubby \Scrub"by\ (skr[u^]b"b[y^]), a. [Compar. Scrubbier
   (skr[u^]b"b[i^]*[~e]r); superl. Scrubbiest.]
   Of the nature of scrub; small and mean; stunted in growth;
   as, a scrubby cur. "Dense, scrubby woods." --Duke of Argyll.
   [1913 Webster]