'wholehearted' originates from the combination of 'whole' and 'heart,' where 'whole' meant 'complete' and 'heart' referred to 'the center of emotions.'

'wholehearted' evolved from the Old English word 'heorte,' meaning 'heart,' combined with 'whole,' which has remained largely unchanged.

Initially, it meant 'complete sincerity,' and this meaning has largely remained the same in modern usage.