Wiktionary
n. The characteristic of being brainy.
Usage examples of "braininess".
This is another way of saying that we need some good way of defining exactly what we mean by true braininess.
It has been suggested that this is due to sexual selection itself, braininess being a sexually desirable character (or some manifestation of braininess, such as ability to remember the steps of a long and complicated ritual dance).
When Matthew arrived home from work, especially in the beginning, it was always "Peter said this," or "Peter did that," so full of marvel was her husband at young headache's braininess.
For a long time it was assumed that big brains and upright walking were directly related—that the movement out of the forests necessitated cunning new strategies that fed off of or promoted braininess—so it was something of a surprise, after the repeated discoveries of so many bipedal dullards, to realize that there was no apparent connection between them at all.
When I remind you that we have one motor car for every five and seven-eighths persons in the city, then I give a rock-ribbed practical indication of the kind of progress and braininess which is synonymous with the name Zenith!