'seldom-approved' originates from the combination of 'seldom,' meaning 'not often,' and 'approved,' meaning 'accepted or agreed upon.'

The term 'seldom' comes from Old English 'seldan,' while 'approved' is derived from Old French 'aprover,' which evolved into the modern English 'approve.'

Initially, 'seldom' meant 'rarely' and 'approved' meant 'accepted,' and this meaning has largely remained the same in modern usage.