'unappealing' originates from the prefix 'un-' meaning 'not' and the word 'appealing' from the verb 'appeal', which comes from Latin 'appellare', meaning 'to call upon'.

'appeal' changed from the Old French word 'apeler' and eventually became the modern English word 'appeal'.

Initially, 'appeal' meant 'to call upon', but over time it evolved into its current meaning of 'to attract or interest'.