'improperly' originates from Latin, specifically the word 'improprius,' where 'im-' meant 'not' and 'proprius' meant 'proper.' 'Announce' originates from Latin, specifically the word 'annuntiare,' where 'ad-' meant 'to' and 'nuntiare' meant 'report.'

'improperly' changed from the Old French word 'impropre' and eventually became the modern English word 'improperly.' 'Announce' transformed from the Old French word 'anoncer' and eventually became the modern English word 'announce.'

Initially, 'improperly' meant 'not proper,' and this meaning has largely remained the same in modern usage. 'Announce' initially meant 'to report or declare,' and this meaning has largely remained the same in modern usage.