'warm-hearted' originates from the combination of 'warm' and 'heart,' where 'warm' meant 'having or giving out heat' and 'heart' referred to the organ or the seat of emotions.

'warm-hearted' evolved from the Old English word 'heorte' and the Middle English 'warm,' eventually becoming the modern English word 'warm-hearted.'

Initially, it meant 'having a warm heart,' and over time it evolved into its current meaning of 'kind and sympathetic.'