'infrequently-viewed' originates from the combination of 'infrequent' and 'viewed', where 'infrequent' comes from Latin 'infrequentem', meaning 'not crowded', and 'viewed' is derived from the Old French 'veue', meaning 'sight'.

'infrequentem' transformed into the Middle English 'infrequent', and 'veue' became 'view' in modern English.

Initially, 'infrequent' meant 'not crowded', but over time it evolved to mean 'not occurring often', and 'viewed' has retained its meaning of 'seen or observed'.