noun
- the state of being watchful and ready to notice things or respond quickly
- mental sharpness and quick thinking ability
Examples
- The security guard’s alertness helped prevent the theft.
- Coffee improved her alertness during the long meeting.
- Mental alertness is important for safe driving.
- The teacher praised the student’s alertness in class.
- His alertness to detail made him an excellent editor.
- The medication caused drowsiness and reduced alertness.
- Emergency responders must maintain constant alertness.