'unwelcome' originates from Old English, specifically the word 'unwilcuma,' where 'un-' meant 'not' and 'wilcuma' meant 'welcome guest.'

'unwilcuma' transformed into the Middle English word 'unwelcume,' and eventually became the modern English word 'unwelcome.'

Initially, it meant 'not a welcome guest,' but over time it evolved into its current meaning of 'not wanted or desired.'