'infrequently-checked' originates from the combination of 'infrequent' and 'check', where 'infrequent' comes from Latin 'infrequens', meaning 'not frequent', and 'check' from Old French 'eschequier', meaning 'to inspect'.

'infrequent' changed from the Latin word 'infrequens' and 'check' from the Old French word 'eschequier', eventually forming the modern English term 'infrequently-checked'.

Initially, 'infrequent' meant 'not occurring often', and 'check' meant 'to inspect'. Together, they evolved to describe something that is not often inspected.