1. having a poor memory; likely to forget things

Examples

• My grandmother has become quite forgetful in her old age.
• I’m so forgetful that I write everything down in my planner.
• He’s forgetful about taking his medication every morning.
• She felt embarrassed about being forgetful with people’s names.
• The forgetful student left his homework at home again.
• Don’t be forgetful about locking the door when you leave.