English

inexecution

From in- + execution.

Proto-Indo-European *h₁én ‘in’

Proto-Germanic *in ‘into’

English in-

Latin exsequor ‘to follow out’

Latin exsecutiō ‘performance, execution’

Old French execution

Today it means

noun Failure to execute or carry out.

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

Etymograph / inexecution