'inbornness' originates from English, specifically formed by the adjective 'inborn' plus the noun-forming suffix '-ness' (from Old English '-nes(s)e') meaning 'state or quality'.

'inborn' is built from the preposition 'in' + the past participle 'born' (from Old English 'boren', past participle of 'beran' meaning 'to bear'); the suffix '-ness' (Old English '-nes(s)e') was later attached to create the abstract noun 'inbornness'.

Initially related to the literal notion of being born or borne in a condition, the formation came to denote the abstract quality of being innate; over time the emphasis shifted to 'innate quality' rather than the act or fact of birth.