'nonfunctional' originates from the prefix 'non-' meaning 'not' and the word 'functional' which comes from 'function', derived from Latin 'functio' meaning 'performance'.

'Function' evolved from the Latin word 'functio', which was adapted into Middle English as 'function', and eventually became 'functional' in modern English.

Initially, 'function' meant 'performance or execution', but over time, 'functional' evolved to mean 'working or operating'.