'poorly-researched' originates from the combination of 'poorly,' meaning 'in a poor manner,' and 'researched,' the past participle of 'research,' which comes from the Old French 'recercher,' meaning 'to seek out.'

'researched' changed from the Old French word 'recercher' and eventually became the modern English word 'research.'

Initially, 'research' meant 'to seek out,' but over time it evolved into its current meaning of 'systematic investigation.'