'uninterpretable' originates from English, formed from the negative prefix 'un-' (Old English) + the adjective 'interpretable', which ultimately comes from Latin, specifically the word 'interpretari', where the root 'interpret-' (from Latin 'interpres') meant 'explain/interpret' and the suffix '-able' meant 'capable of'.

'interpret' changed from Latin 'interpretari' into Old French/Medieval Latin forms (e.g. 'interpretare') and then into Middle English 'interpreten'/'interpret', producing the adjective 'interpretable' and later the prefixed form 'uninterpretable' in Modern English.

Initially related to 'explaining' or 'translating' (to give meaning), but with the addition of the negative prefix 'un-' and the adjectival suffix '-able' it evolved to mean 'not capable of being interpreted' in modern usage.