clear-headedness

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]