Source : Webster's Revised Unabridged Dictionary (1913)

Overstate \O`ver*state"\, v. t. [imp. & p. p. {Overstated}; p.
   pr. & vb. n. {Overstating}.]
   To state in too strong terms; to exaggerate. --Fuller.

Source : WordNet®

overstated
     adj : represented as greater than is true or reasonable; "an
           exaggerated opinion of oneself" [syn: {exaggerated}, {overdone}]