shortness; brevity
The quality or degree of being short in length, duration, or conciseness. Used for physical length, time, or abstract brevity.
The shortness of this skirt is just right.
I was surprised by the brevity of the meeting.
Derived from the adjective 短い (みじかい, 'short') by adding the nominalizing suffix さ, which forms a noun expressing the degree or quality of the adjective.