'rarely-developed' originates from the combination of 'rarely,' meaning 'not often,' and 'developed,' meaning 'brought to a more advanced or effective state.'

'rarely' comes from Middle English 'rarely,' from Old English 'hrēorlice,' and 'developed' comes from the French word 'développer,' which means 'to unfold.'

Initially, 'rarely' meant 'seldom' and 'developed' meant 'unfolded,' but over time, 'developed' evolved to mean 'brought to a more advanced state.'