unlevel

From un- +‎ level.

unlevel (comparative more unlevel, superlative most unlevel)

1. Not level.
   • 2007 June 9, Steven Greenhouse, “Investigating Mislabeling of Workers”, in New York Times‎^[1]:

     It creates an unlevel playing field because some companies are taking unfair advantage.”

unlevel (third-person singular simple present unlevels, present participle unleveling or unlevelling, simple past and past participle unleveled or unlevelled)

1. (transitive) To make no longer level; to apply a bias to.