1. in a way that causes frustration; annoyingly or disappointingly

Examples

• The website was frustratingly slow during peak hours.
• He gave a frustratingly vague answer that didn't help at all.
• The project kept hitting frustratingly small delays that added up over time.
• She found the rules frustratingly inconsistent.
• The customer service was frustratingly unhelpful with my complaint.
• The test was frustratingly difficult for most students.
• It's frustratingly hard to find good customer support these days.