clearheadedness
nounUK /ˌklɪəˌhedɪdˈnəs/
US /ˌklɪrˌhedɪdˈnəs/
The ability to think clearly and calmly without getting confused.
Her clearheadedness helped the team solve the problem quickly.
OTHER MEANINGS
2. The state of being free from confusion or mental fog.
After a good night's sleep, he felt a welcome clearheadedness.
3. The quality of making sensible decisions under pressure.
The pilot's clearheadedness saved everyone on board.
4. Freedom from dizziness or lightheadedness.
She drank water and soon regained her clearheadedness.