1. [adv]  in a weak or feeble manner or to a minor degree; "weakly agreed to a compromise"; "wheezed weakly"; "he was weakly attracted to her"
2. [adj]  lacking physical strength or vitality; "a feeble old woman"; "her body looked sapless"

WEAKLY is a 6 letter word that starts with W.

1. \Weak"ly\, adv.
   In a weak manner; with little strength or vigor; feebly.
   
   

2. \Weak"ly\, a. [Compar. {Weaklier}; superl. {Weakliest}.]
   Not strong of constitution; infirm; feeble; as, a weakly
   woman; a man of a weakly constitution.