'undisguised' originates from the prefix 'un-' meaning 'not' and the word 'disguised' from Old French 'desguiser', where 'des-' meant 'away' and 'guise' meant 'appearance'.

'disguised' changed from the Old French word 'desguiser' and eventually became the modern English word 'disguise', with 'undisguised' forming by adding the prefix 'un-'.

Initially, 'disguise' meant 'to change appearance', and 'undisguised' evolved to mean 'not hidden or concealed'.