'infrequently-paired' originates from the combination of 'infrequent' and 'paired', where 'infrequent' means 'not occurring often' and 'paired' means 'joined or combined with another'.

'Infrequent' comes from the Latin word 'infrequens', and 'paired' comes from the Old French 'pair', which means 'equal'.

Initially, 'infrequent' meant 'not crowded', but over time it evolved to mean 'not occurring often'. 'Paired' has largely retained its meaning of 'joined with another'.