stone in one's path

barrier blank wall catch complication deterrent difficulty discouragement drawback hindrance hitch hurdle impediment limitation obstacle obstruction snag stumbling block

barrier complication deterrent difficulty drawback hindrance hitch hurdle impediment obstacle setback snag

Catch-22 barricade blockage catch clog delay discouragement drag fly in the ointment holdup limitation obstruction restraint road block stumbling stone

advance advantage aid assistance benefit blessing boon ease encouragement help opening peace