'unfunny' originates from the prefix 'un-' meaning 'not' and the word 'funny', which comes from the Old English 'fon', meaning 'to fool'.

'funny' evolved from the Old English word 'fon', which meant 'to fool', and eventually became the modern English word 'funny'.

Initially, 'funny' meant 'to fool or trick', but over time it evolved into its current meaning of 'amusing or entertaining'.