'ingratitude' originates from Latin, specifically the word 'ingratitudo,' where 'in-' meant 'not' and 'gratus' meant 'pleasing or thankful.'

'ingratitudo' transformed into the Old French word 'ingratitude,' and eventually became the modern English word 'ingratitude' through Middle English.

Initially, it meant 'not pleasing or thankful,' and this meaning has largely remained the same in modern usage.