'inconsistently-decorated' originates from English compounding, ultimately from Latin roots: the prefix 'in-' meaning 'not', 'consistent' from Latin 'consistere' meaning 'to stand together', and 'decorate' from Latin 'decorare' meaning 'to adorn'.

'decorare' transformed into French 'décorer' and became English 'decorate'; Latin 'consistere' yielded English 'consistent' via Late Latin/Old French. English formed the adverb 'inconsistently' (in- + consistent + -ly) and combined it with the past participle adjective 'decorated' to create the modern compound 'inconsistently-decorated'.

Originally, the roots conveyed 'not standing together' (lack of agreement) and 'to adorn'; in modern use, the compound means 'adorned in a non-uniform or mismatched manner'.