n. pl. -the state of or quality of being arbid.
He was discovering his own capability for arbidity by suddenly deciding to swim the English Channel with his slacks still on.
adj. -determined by, arising from, or marked by whimsy, caprice, and/or randomness rather than reason, judgment, necessity, or principle.
Derived from arbitrary.
The professor graded the students' papers in an arbid fashion, neglecting to look at any of their actual answers but instead passing out random marks based on the quality of their handwriting.