English

inable

From in- (“not”) + able.

Formed from in- ‘not’ + able

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Proto-Indo-European *gʰeh₁bʰ- ‘to grab, take’

…

Latin habeō ‘to have’

Latin habilis ‘easily managed, held, or handled’

Old Northern French able ‘able’

Middle English able ‘capable’

English able

Today it means

adj Unable, not able.

Language periods are conventional ranges, not dates for this word.