'improperly-done' originates from the combination of 'improperly' and 'done', where 'improperly' is derived from Latin 'improprius', meaning 'not proper', and 'done' is the past participle of 'do'.

'improperly' changed from the Latin word 'improprius' and eventually became the modern English word 'improperly'. 'Done' evolved from Old English 'don', which meant 'to perform or execute'.

Initially, 'improperly' meant 'not suitable or appropriate', and 'done' meant 'completed or finished'. Together, they convey the idea of something completed in an incorrect manner.