Synonyms to undecorative

unaesthetic, beautiless, blemished, blotted, cacophonic, cacophonous, defaced, disfigured, dysphemistic, dysphemized, homely, inelegant, marred, plain, short on looks, spoiled, uglified, ugly, ugly as hell, ugly as sin, unartistic, unattractive, unbeautiful, uncomely, unhandsome, unlovely, unornamental, unpleasing, unpretty, unsightly