The definition of scruffy is someone or something that is unkempt and untidy.(adjective)
A messy beard that you do not take care of is an example of a scruffy beard.
See scruffy in Webster's New World College Dictionary
See scruffy in American Heritage Dictionary 4
adjective scruff·i·er, scruff·i·est
Origin: From obsolete scruff, scurf
Origin: , variant of scurf; see scurf.
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