'rarely-executed' originates from the combination of 'rarely,' meaning 'not often,' and 'executed,' meaning 'carried out or performed.'

'Rarely' comes from Middle English 'rarelī,' and 'executed' from Latin 'exsecutus,' the past participle of 'exsequi,' meaning 'to follow out.'

Initially, 'rarely-executed' meant 'not often carried out,' and this meaning has largely remained the same in modern usage.