'nonproclaimable' originates from Modern English, formed by the prefix 'non-' + the adjective 'proclaimable', where 'non-' meant 'not' and 'proclaimable' meant 'able to be proclaimed'.

'proclaim' originates from Latin, specifically the word 'proclamare', where 'pro-' meant 'forth' and 'clamare' meant 'to shout'; it passed into Old French as 'proclamer' and into Middle English as 'proclamen', eventually becoming the modern English 'proclaim'. The adjective 'proclaimable' was formed by adding the suffix '-able' to 'proclaim', and 'nonproclaimable' was later formed by prefixing 'non-'.

Initially, 'proclaim' meant 'to call out or shout forth', but over time it evolved into its current meaning of 'to announce or declare formally'. 'Nonproclaimable' accordingly means 'not able to be announced or formally declared'.