'libido-reducing' originates from Modern English, formed by combining the noun 'libido' (from Latin 'libido') and the present participle 'reducing' (from Latin 'reducere' via Old French and Middle English), where 'libido' meant 'desire' and 'reducere' meant 'to lead back/bring back'.

'libido' originates from Latin, specifically the word 'libido'; 'reduce' comes from Latin 'reducere', passed into Old French and Middle English as 'reducen/reduces' and eventually the modern English 'reduce', and the compound adjective 'libido-reducing' is a modern English formation combining these elements.

Initially, 'libido' meant 'desire' in Latin and 'reducere' meant 'to lead back'; over time the compound 'libido-reducing' has come to mean 'causing a decrease in sexual desire'.