Incompatible

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late Middle English: from medieval Latin incompatibilis, from in- ‘not’ + compatibilis (see compatible).

wiktionary

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French incompatible.

etymonline

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incompatible (adj.)

"that cannot coexist or be conjoined," mid-15c., from Medieval Latin incompatibilis, from in- "not, opposite of" (see in- (1)) + compatibilis (see compatible). Originally of benefices, "incapable of being held together;" sense of "mutually intolerant" is from 1590s. Related: Incompatibly.