'seldom-supported' is a compound word formed from 'seldom' and 'supported'. 'Seldom' originates from Old English 'seldan', meaning 'rarely', and 'supported' comes from Latin 'supportare', meaning 'to carry' or 'to bear'.

The term 'seldom-supported' evolved as a descriptive phrase in modern English to indicate something that is not often backed or endorsed.

Initially, 'seldom' meant 'rarely', and 'supported' meant 'to bear or hold up'. Together, they convey the idea of something not often backed.