Source : Webster's Revised Unabridged Dictionary (1913)

Exhaustive \Ex*haust"ive\, a.
   Serving or tending to exhaust; exhibiting all the facts or
   arguments; as, an exhaustive method. {Ex*haust"ive*ly}, adv.

Source : WordNet®

exhaustively
     adv : in an exhaustive manner; "we searched the files thoroughly"
           [syn: {thoroughly}]