'unscholastic' originates from English, specifically the prefix 'un-' + the adjective 'scholastic', where 'un-' meant 'not' and 'scholastic' came via Latin 'scholasticus' (from Greek).

'scholastic' comes from Latin 'scholasticus', from Greek 'scholastikos' (from 'scholē' meaning 'leisure, discussion, school'); English formed 'scholastic' and later created 'unscholastic' by adding the productive English prefix 'un-'; 'unscholastically' is the adverbial form formed with '-ally'.

Initially 'scholastic' meant 'pertaining to school or learned discussion' (from Greek 'scholē'), later often came to mean 'relating to scholasticism or formal academic methods'; the prefix 'un-' negates this, so 'unscholastic'/'unscholastically' mean 'not scholastic' or 'not academic' in modern usage.