1. to cause great trouble or suffering to someone or something
2. to confuse or frustrate someone completely

Examples

• Technical problems continued to bedevil the software launch.
• The quarterback was bedeviled by injuries throughout the season.
• Complex regulations bedevil small business owners.
• The math problem bedeviled students for hours.
• Financial difficulties have bedeviled the company for years.
• The mystery bedeviled detectives for months.
• Bad weather bedeviled the construction project.