'unintuitive' originates from the prefix 'un-' meaning 'not' and the word 'intuitive', which comes from Latin 'intuitus', meaning 'looked upon' or 'considered'.

'Intuitus' transformed into the English word 'intuitive', and with the addition of the prefix 'un-', it became 'unintuitive'.

Initially, 'intuitive' meant 'looked upon' or 'considered', but over time it evolved to mean 'understood without reasoning'. 'Unintuitive' negates this meaning.