1. the quality of not being dependable or trustworthy

Examples

• The car’s unreliability made him late for work several times.
• Her unreliability as a friend damaged their relationship.
• The witness’s unreliability weakened the prosecution’s case.
• The old equipment’s unreliability caused frequent production delays.
• Students complained about the unreliability of the campus internet.
• The weather forecast’s unreliability made planning difficult.