"Level-headedness" refers to the ability to stay calm, think clearly, and make rational decisions, even in stressful or difficult situations. Full definition
The position of Competition Bureau chief is one which requires level headedness, circumspect and calm rationale, not to mention dedication and perseverance. (remonline.com)
Cech was really good, he was assured, brought a level headedness to our area. (justarsenal.com)