weak-kneed

from WordNet (r) 3.0 (2006)
weak-kneed
    adj 1: lacking will power or resolution; "the role of the
           dissenter is not for the weak-kneed"
from The Collaborative International Dictionary of English v.0.48
Weak-kneed \Weak"-kneed`\, a.
   Having weak knees; hence, easily yielding; wanting
   resolution. --H. James.
   [1913 Webster]
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