The Collaborative International Dictionary
Sober-minded \So"ber-mind`ed\, a. Having a disposition or temper habitually sober. -- So"ber-mind`ed*ness, n.
Usage examples of "sober-mindedness".
She was dry and sober to the point of maliciousness, but her sober-mindedness went hand in hand with an imagination unbridled in everything to do with superstition.