Tolerable

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late Middle English: via Old French from Latin tolerabilis, from tolerare (see tolerate).

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Borrowed from Middle French tolerable, from Latin tolerābilis.

etymonline

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tolerable (adj.)

early 15c., "bearable," from Old French tolerable (14c.) and directly from Latin tolerabilis "that may be endured, supportable, passable," from tolerare "to tolerate" (see toleration). Meaning "moderate, middling, not bad" is recorded from 1540s. Related: Tolerably.