'uncolonnaded' originates from English, specifically formed with the prefix 'un-' and the word 'colonnaded' (from French 'colonnade', from Italian 'colonna'), where 'un-' meant 'not' and the Latin root 'columna' meant 'column'.

'uncolonnaded' changed from the English adjective 'colonnaded' (derived via French 'colonnade' from Italian 'colonna' and Latin 'columna') and eventually became the modern English word 'uncolonnaded' by the addition of the negative prefix 'un-'.

Initially, the related root 'colonnade' meant 'a row or series of columns' and 'colonnaded' meant 'having such columns'; by adding 'un-' the word has meant 'not having columns' and that negated sense has remained its meaning.