The Collaborative International Dictionary of English v.0.48:

Patronless \Pa"tron*less\, a.
   Destitute of a patron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

patronless
    adj 1: having little patronage or few clients; "a restaurant
           unpatronized by the elite" [syn: unpatronized,
           unpatronised, patronless] [ant: patronised,
           patronized]