troublesome

/ˈtrʌbəlsəm/
adjective
  1. Causing difficulty, worry, or annoyance.
    • Her troublesome cough kept her awake all night.
    • The old car has a troublesome engine that keeps stalling.
    • Dealing with troublesome customers requires patience.
  2. Involving or causing problems or conflict.
    • The project hit a troublesome phase when funding was cut.
    • He tried to avoid the troublesome topic of politics at dinner.
    • The region has a long history of troublesome border disputes.