The Collaborative International Dictionary of English v.0.48:

Puny \Pu"ny\, a. [Compar. Punier; superl. Puniest.] [F.
   pu[^i]t['e] younger, later born, OF. puisn['e]; puis
   afterwards (L. post; see Post-) + n['e] born, L. natus. See
   Natal, and cf. Puisne.]
   Imperfectly developed in size or vigor; small and feeble;
   inferior; petty.
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         A puny subject strikes at thy great glory. --Shak.
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         Breezes laugh to scorn our puny speed.   --Keble.
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