Unpleasantly bright in colour or decoration. (Cambridge Dictionary)
Ostentatiously or tastelessly ornamented. (Merriam – Webster)
Marked by extravagance or sometimes tasteless showiness: Outlandish. (Merriam – Webster)
Extravagantly bright or showy, typically so as to be tasteless. (Oxford Dictionaries)
If something is gaudy, it is very brightly-coloured and showy. (Collins Dictionary)
Does the word Gaudy come from the Catalan Architect A. Gaudi?
Gaudy and Ornate.