Cheapener is derived from the word 'cheap', which signifies something that is low-cost, shoddy, or inferior in quality. Therefore, the synonyms for cheapener would also refer to actions or things that reduce the value of quality or increase low-cost options. Some of the possible synonyms are: impoverish, reduce, cut corners, lower, undercut, depreciate, decrease, minimize, diminish, belittle, downgrade, and devalue. All these words can describe an action or process that makes something cheap or of poor quality. The use of such words can often be negative and indicate poor quality or low value, which is why it's important to choose the right words carefully.