Fallible/ˈfæləbl/ Definition 1 of 1Pro Tip 1/3Human Nature Use 'fallible' to highlight human imperfection in behavior and judgment. Even the best leaders are fallible sometimes. Pro Tip 2/3Acknowledge Error 'Fallible' is often used to remind others that mistakes are a possibility. Be patient with yourself; everyone is fallible. Pro Tip 3/3System Vulnerability Describe a process or system that could fail due to human error or flaws. This safety protocol is fallible, we need a backup.