Source : Webster's Revised Unabridged Dictionary (1913)

Faintly \Faint"ly\, adv.
   In a faint, weak, or timidmanner.

Source : WordNet®

faintly
     adv : to a faint degree or weakly perceived; "between him and the
           dim light a form was outlined faintly"; "stars shining
           faintly through the overcast"; "could hear his distant
           shouts only faintly"; "the rumors weren't even faintly
           true"