'seldom-checked' originates from the combination of 'seldom' and 'checked', where 'seldom' means 'not often' and 'checked' means 'examined or verified'.

'seldom' comes from Old English 'seldan', and 'checked' comes from Middle English 'chekken', which evolved from Old French 'eschequier'.

Initially, 'seldom' meant 'rarely', and 'checked' meant 'examined'. Together, they have maintained the meaning of 'rarely examined'.