·adj Having weak knees; hence, easily yielding; wanting resolution.
·vi Wanting physical strength. II. Weak ·vi Tending towards lower prices; as, a weak market. III. ...
Webster's Dictionary of the English Language
·adj Having knees;- used chiefly in composition; as, in-kneed; out-kneed; weak-kneed. II. Kneed ·ad...
·adj Having little courage; of feeble spirit; dispirited; faint-hearted. ...
·adj Having a weak mind, either naturally or by reason of disease; feebleminded; foolish; idiotic. ...
·adj ·see Knock-kneed. ...
·adj Having the legs bent inward so that the knees touch in walking. ...
One whose knees knock together in walking, as if kneading dough. ...
Dictionary of The Vulgar Tongue by Francis Grose