Source : Webster's Revised Unabridged Dictionary (1913)

Faintness \Faint"ness\, n.
   1. The state of being faint; loss of strength, or of
      consciousness, and self-control.

   2. Want of vigor or energy. --Spenser.

   3. Feebleness, as of color or light; lack of distinctness;
      as, faintness of description.

   4. Faint-heartedness; timorousness; dejection.

            I will send a faintness into their hearts. --Lev.
                                                  xxvi. 36.

Source : WordNet®

faintness
     n 1: barely audible
     2: the quality of being dim [syn: {dimness}]