'rarely-communicated' originates from the combination of 'rarely,' meaning 'not often,' and 'communicated,' meaning 'to convey or share information.'

'Rarely' and 'communicated' have been used separately in English since the Middle Ages, but their combination into 'rarely-communicated' is a modern construct.

Initially, 'rarely' meant 'seldom' and 'communicated' meant 'shared information.' The combined form retains these meanings.