'juiciness' originates from English, specifically the word 'juice' combined with the suffix '-ness', where 'juice' ultimately comes from Old French 'jus' (from Latin 'jus'), in which 'jus' meant 'broth, sauce, liquid'.

'juice' entered Middle English from Old French 'jus' (meaning broth or liquid); the Middle English form developed into modern English 'juice' (influenced by spelling and pronunciation changes), and the noun 'juiciness' was later formed by adding the productive English suffix '-ness'.

Initially it referred to 'broth or liquid' in Latin/Old French usage; over time it shifted to mean 'the liquid in fruit or flesh' and then the English noun came to mean 'the quality of being juicy' and, by extension, figurative senses such as 'interesting or sensational content'.