'thoughtfully-assessed' originates from the combination of 'thoughtful' and 'assess,' where 'thoughtful' means 'showing careful consideration' and 'assess' means 'to evaluate or estimate the nature, ability, or quality of something.'

'thoughtful' and 'assess' were combined in modern English to form the compound adjective 'thoughtfully-assessed.'

Initially, 'thoughtful' meant 'full of thought,' and 'assess' meant 'to sit beside' in Latin, but over time, they evolved into their current meanings of 'careful consideration' and 'evaluation,' respectively.