'unconventionally' originates from the prefix 'un-' meaning 'not' and the word 'conventional,' which comes from Latin 'conventionem,' meaning 'a meeting or assembly.'

'conventionem' transformed into the Old French word 'convention,' and eventually became the modern English word 'conventional.'

Initially, it meant 'pertaining to a meeting or assembly,' but over time it evolved into its current meaning of 'based on or in accordance with what is generally done or believed.'