'non-censorious' combines the negative prefix 'non-' (originating from Latin 'non', where 'non' meant 'not') with 'censorious' (derived from Latin 'censēre', where 'censēre' meant 'to assess, to judge', plus the adjectival suffix '-ous').

'censorious' developed from Latin 'censēre' → Late Latin/Old French forms related to 'censor' and the suffix '-ous' → Middle English 'censorious', and the modern compound 'non-censorious' formed by adding the prefix 'non-' in modern English.

Initially related to 'assessment' or an official 'censor' (from Latin), 'censorious' came to mean 'inclined to censure or criticize', and 'non-censorious' now means 'not inclined to censure' or 'not critical'.