'inexpertly-applied' originates from the combination of 'inexpertly' and 'applied', where 'inexpertly' is derived from 'inexpert', meaning 'lacking skill or knowledge', and 'applied' is the past participle of 'apply', meaning 'to put to use'.

'inexpertly' changed from the Old French word 'inexpert', and 'applied' from the Latin word 'applicare', eventually forming the modern English term 'inexpertly-applied'.

Initially, 'inexpertly' meant 'without skill', and 'applied' meant 'put to use'. Together, they evolved to describe something done without skill.