Inconvenient
late Middle English (originally in the sense ‘incongruous’ or ‘unsuitable’): via Old French from Latin inconvenient-, from in- ‘not’ + convenient- ‘agreeing, fitting’ (see convenient). Current senses date from the mid 17th century.
wiktionary
Borrowed from Middle French inconvenient, from Latin inconvenientem.
etymonline
inconvenient (adj.)
late 14c., "injurious, dangerous," also "absurd, illogical" (senses now obsolete), from Latin inconvenientem (nominative inconveniens) "unsuitable, not accordant, dissimilar," from in- "not, opposite of" (see in- (1)) + convenientem (see convenient). In early 15c., "inappropriate, unbecoming, unnatural;" also, of an accused person, "unlikely as a culprit, innocent." Sense of "troublesome, incommodious, awkward" is recorded from 1650s.
