'imperfectly-built' originates from the combination of 'imperfectly' and 'built'. 'Imperfectly' comes from Latin 'imperfectus', where 'im-' meant 'not' and 'perfectus' meant 'completed'. 'Built' is the past participle of 'build', which comes from Old English 'byldan', meaning 'to construct'.

'Imperfectly' evolved from the Latin 'imperfectus' through Old French 'imparfait', and 'built' evolved from Old English 'byldan'.

Initially, 'imperfectly' meant 'not completed', and 'built' meant 'constructed'. Together, they describe something constructed in a flawed manner.