'unsuitably-stated' originates from English, combining the adverb 'unsuitably' (from Old English 'un-' meaning 'not' + 'suitable' ultimately related to Latin 'sequī' 'to follow, be fitting', with the adverbial suffix '-ly') and the past participle 'stated' (from Old French 'estat' and Latin 'stare'/'status' meaning 'to stand' > 'state' > 'to express in words').

'unsuitably-stated' developed in Modern English from the open phrase 'unsuitably stated' and has been used as a hyphenated participial adjective in attributive position, becoming the modern English form 'unsuitably-stated'.

Initially, it meant 'stated in an unsuitable manner,' and this meaning has remained stable in modern usage as 'expressed in a way that is inappropriate or ill-phrased.'