'diligently' originates from Latin, specifically the word 'diligentia,' where 'diligere' meant 'to love or take delight in.' 'Constructed' comes from Latin 'constructus,' the past participle of 'construere,' meaning 'to heap together.'

'Diligently' changed from the Old French word 'diligent' and eventually became the modern English word 'diligently.' 'Constructed' evolved from the Latin 'constructus' through Middle English.

Initially, 'diligently' meant 'with love or delight,' but over time it evolved into its current meaning of 'with careful and persistent effort.' 'Constructed' has largely retained its original meaning of 'built or assembled.'