'annoyer' originates from Old French, specifically the word 'anoier' (later French 'ennuyer'), ultimately from Vulgar Latin '*inodiare', where 'in-' meant 'in' and Latin 'odium' meant 'hatred'.

'annoyer' changed from Old French 'anoier'/'ennuyer' and Middle English forms such as 'annoyen', and eventually became the modern English word 'annoy' and the agent noun form 'annoyer'.

Initially, it meant 'to cause hatred or displeasure', but over time it evolved into its current sense of 'to irritate or bother'.