'seldom-dispatched' originates from the combination of 'seldom' and 'dispatched', where 'seldom' means 'not often' and 'dispatched' means 'sent off to a destination'.

'seldom' comes from Old English 'seldan', and 'dispatched' comes from the Italian 'dispacciare', which evolved into the modern English word 'dispatch'.

Initially, 'seldom' meant 'rarely', and 'dispatch' meant 'to send off', which together convey the idea of something not often sent.