'precariously' originates from Latin, specifically the word 'precarius,' where 'precari' meant 'to pray or entreat.' 'Constructed' comes from Latin 'constructus,' the past participle of 'construere,' meaning 'to heap together.'

'precariously' changed from the Latin word 'precarius' and eventually became the modern English word 'precarious.' 'Constructed' evolved from the Latin 'constructus' through Old French 'construire' and Middle English 'constructen.'

Initially, 'precarious' meant 'dependent on the will of another,' but over time it evolved into its current meaning of 'unstable or insecure.' 'Constructed' has largely retained its original meaning of 'built or assembled.'