"not exact or correct," 1690s, from in- (1) "not" + accurate. Unaccurate is attested from 1670s. Related: Inaccurately (1660s).
the thermometer is inaccurate
an inaccurate translation
-ina
inability
inable
inaccessible
inaccuracy
inaccurate
inaction
inactive
inactivity
inadequacy
inadequate
