'inexperienced' originates from the prefix 'in-' meaning 'not' and the word 'experienced', which comes from Latin 'experientia', meaning 'trial, experiment'.

'experientia' transformed into the Old French word 'experience', and eventually became the modern English word 'experience', with 'in-' added to denote the lack of it.

Initially, it meant 'not having undergone trials or experiments', but over time it evolved into its current meaning of 'lacking experience or knowledge'.