The Collaborative International Dictionary of English v.0.48:
Twopenny \Two"pen*ny\, a. Of the value of twopence. [1913 Webster] Two-phaseWordNet (r) 3.0 (2006):
twopenny adj 1: of trifling worth [syn: sixpenny, threepenny, twopenny, tuppeny, two-a-penny, twopenny- halfpenny]