'uncommercially' originates from English, specifically formed from the prefix 'un-' + the adjective 'commercial', where 'un-' meant 'not' and 'commercial' related to 'commerce' or trade.

'commercial' comes into English via Middle French 'commercial' and Medieval Latin 'commercialis' from Latin 'commercium' meaning 'trade'; the adverbial suffix '-ly' was added in English to form 'commercially', and the negative prefix 'un-' was applied to create 'uncommercial' and then 'uncommercially'.

Initially related directly to 'commerce' or 'trade' (i.e., 'of or relating to commerce'), and over time the negative form came to mean 'not intended for commerce' or 'not performed for profit'; this sense is preserved in the adverb 'uncommercially' meaning 'in a non-commercial way'.