look up any word, like cleveland steamer:
 
1.
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.
by sathav July 03, 2011