'unskimmed' originates from the prefix 'un-' meaning 'not' and the verb 'skim', which comes from Middle English 'skimmen', derived from Old Norse 'skima', meaning 'to shine or gleam'.

'skim' changed from the Old Norse word 'skima' and eventually became the modern English word 'skim'.

Initially, 'skim' meant 'to shine or gleam', but over time it evolved into its current meaning of 'to remove a substance from the surface'.