Evensteven is a term used to describe a situation in which two parties are equally balanced or fair. The antonyms for evensteven could be unbalanced, uneven or unfair. In an unbalanced scenario, one party has an unfair advantage over the other. For instance, a company might offer more benefits and incentives to a male employee than a female employee who has the same qualifications and work experience. Uneven means not uniform or consistent, and could be used to describe a situation where one aspect is more prominent than the other- for example, a puzzle with pieces of varying sizes. Alternatively, unfair implies unjust and partial treatment of one person or group over another.