'infrequently-shared' originates from the combination of 'infrequent' and 'shared', where 'infrequent' means 'not occurring often' and 'shared' means 'distributed among others'.

'Infrequent' comes from the Latin word 'infrequens', and 'shared' comes from the Old English 'scearu', meaning 'division'.

Initially, 'infrequent' meant 'not crowded', but over time it evolved to mean 'not occurring often'. 'Shared' has largely retained its meaning of 'distributed among others'.