The state or characteristic of being runny or free-flowing.(noun)
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Use "runniness" in a sentence
"Speaking of the runniness, I am kinda sad this pie did not photograph better -- I just cannot express enough how incredibly good it is."
"Certain kinds of chemicals that are released in the nose can lead to nasal symptoms like itching, runniness, stuffiness and sneezing."
"It produces eggs that aren't so much scrambled as an emulsion - moist, creamy, smooth, and free of the horrible lumps and runniness that scrambled eggs can produce."