1. a person or thing that causes frustration or prevents success
Usage: informal; agent noun derived from 'frustrate'

Examples

• The slow internet connection was a major frustrater during the online exam.
• Lack of communication is often a frustrater in team projects.
• He found that perfectionism was his own worst frustrater.
• The bureaucratic process proved to be a frustrater for many applicants.
• Technical glitches were the main frustrater preventing us from finishing on time.