English
inaptness
From inapt + -ness.
Formed from inapt + -ness
Proto-Indo-European *h₂ep- ‘to join, fit (in)’
…
Proto-Italic *aptos
Latin aptus ‘suitable, adapted’
French apte ‘apt’
French inapte
English inapt
Today it means
noun Quality of being inapt.
Language periods are conventional ranges, not dates for this word.
Etymograph / inaptness