Unable
来自Big Physics
wiktionary
From Middle English unable, unabel, unhable, unhabil, equivalent to un- + able.
From Middle English unablen, equivalent to un- + able.
etymonline
unable (adj.)
late 14c., "lacking in ability, incapable," from un- (1) "not" + able (adj.). Modeled on Old French inhabile or Latin inhabilis.
