Impatient

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late Middle English (in the senses ‘lacking patience’ and ‘unbearable’): via Old French from Latin impatient- ‘not bearing, impatient’, from in- ‘not’ + pati ‘suffer, bear’.

wiktionary

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From Old French impacient (modern French impatient), from Latin impatiēns.

etymonline

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impatient (adj.)

late 14c., from Old French impacient "impatient" (Modern French impatient), from Latin impatientem (nominative impatiens) "that cannot bear, intolerant, impatient," from assimilated form of in- "not, opposite of" (see in- (1)) + patiens "bearing, enduring" (see patience). Related: Impatiently.