The Collaborative International Dictionary
Clear-headedness
Clear-headed \Clear"-head`ed\ (kl[=e]r"h[e^]d`[e^]d), a.
Having a clear understanding; quick of perception;
intelligent. ``He was laborious and clear-headed.''
--Macaulay. -- Clear"-head`ed*ness, n.
Wiktionary
clear-headedness
n. the state of being clear-headed
Usage examples of "clear-headedness".
If I presumed to ease your mind, forgive me, but the time is now for clear-headedness, yes?
In the latter case, he was experiencing that clear-headedness sometimes granted to people just about to die.