unappealing
adjective /ˌʌnəˈpiːlɪŋ/
  /ˌʌnəˈpiːlɪŋ/
- not attractive or pleasant
- The room was painted in an unappealing shade of brown.
 - The prospect of studying for another five years was distinctly unappealing.
 - The idea of hiring a wedding dress is unappealing to many brides.