Impersonal

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late Middle English (in impersonal (sense 3)): from late Latin impersonalis, from Latin in- ‘not’ + personalis (see personal).

wiktionary

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From French impersonnel, from Latin impersōnālis, from im-(“not”) + persōnālis(“personal”).

etymonline

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impersonal (adj.)

mid-15c., a grammatical term, from Late Latin impersonalis, from assimilated form of in- "not, opposite of" (see in- (1)) + personalis "personal" (see personal). Sense of "not connected with any person" is from 1620s; that of "not endowed with personality, having no conscious individuality" is from 1842. Related: impersonally.