Unable

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wiktionary

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From Middle English unable, unabel, unhable, unhabil, equivalent to un- +‎ able.

From Middle English unablen, equivalent to un- +‎ able.


etymonline

ref

unable (adj.)

late 14c., "lacking in ability, incapable," from un- (1) "not" + able (adj.). Modeled on Old French inhabile or Latin inhabilis.

取自“https://www.bigphysics.org/index.php?title=Unable&oldid=20167”