'amateurishly-managed' originates from the word 'amateur,' which comes from French 'amateur,' meaning 'lover of,' and 'manage,' from Italian 'maneggiare,' meaning 'to handle.'

'amateur' changed from the French word 'amateur' and 'manage' from Italian 'maneggiare,' eventually becoming the modern English phrase 'amateurishly-managed.'

Initially, 'amateur' meant 'lover of,' but over time it evolved to imply a lack of professional skill, especially when combined with 'managed.'