Source : Webster's Revised Unabridged Dictionary (1913)

Flatly \Flat"ly\, adv.
   In a flat manner; evenly; horizontally; without spirit;
   dully; frigidly; peremptorily; positively, plainly. ``He
   flatly refused his aid.'' --Sir P. Sidney.

         He that does the works of religion slowly, flatly, and
         without appetite.                        --Jer. Taylor.

Source : WordNet®

flatly
     adv : in an unqualified manner; "he flatly denied the charges"
           [syn: {categorically}, {unconditionally}]