Source : Webster's Revised Unabridged Dictionary (1913)

Sixpenny \Six"pen`ny\, a.
   Of the value of, or costing, sixpence; as, a sixpenny loaf.

Source : WordNet®

sixpenny
     adj : of trifling worth [syn: {threepenny}, {twopenny}, {tuppeny},
            {two-a-penny}, {twopenny-halfpenny}]