'adequately' originates from Latin, specifically the word 'adaequatus,' where 'ad-' meant 'to' and 'aequus' meant 'equal.' 'Related' comes from Latin 'relatus,' the past participle of 'referre,' meaning 'to bring back.'

'Adequately' changed from the Latin 'adaequatus' to the Old French 'adequat,' and eventually became the modern English word 'adequate.' 'Related' evolved from the Latin 'relatus' to the Old French 'relater,' and eventually became the modern English word 'related.'

Initially, 'adequately' meant 'made equal to,' but over time it evolved into its current meaning of 'sufficiently.' 'Related' originally meant 'brought back,' but now means 'connected or associated.'