Source : Webster's Revised Unabridged Dictionary (1913)

Inexact \In`ex*act"\, a. [Pref. in- not + exact: cf. F.
   inexact.]
   Not exact; not precisely correct or true; inaccurate.

Source : WordNet®

inexact
     adj 1: not exact [ant: {exact}]
     2: not precisely accurate; "an inexact quotation" [syn: {inaccurate}]