The Collaborative International Dictionary of English v.0.48:

Weakling \Weak"ling\, n. [Weak + -ling.]
   A weak or feeble creature. --Shak. "All looking on him as a
   weakling, which would post to the grave." --Fuller.
   [1913 Webster]

         We may not be weaklings because we have a strong enemy.
                                                  --Latimer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Weakling \Weak"ling\, a.
   Weak; feeble. --Sir T. North.
   [1913 Webster]

WordNet (r) 3.0 (2006):

weakling
    n 1: a person who is physically weak and ineffectual [syn:
         weakling, doormat, wuss]