unsharpens

Verb

unsharpen (third-person singular simple present unsharpens, present participle unsharpening, simple past and past participle unsharpened)

1. (transitive) To render unsharp; to spoil the sharpness of (something).
   • Thus, every product is branded with a legal marking, or a trademark respectively. In addition, as every product has a name, every product allows us to associate knowledge and meaning to this name. As the differentiation of products and brands unsharpens this distinction, we suggest the distinction...2006, Marius K. Lüdicke, A Theory of Marketing: Outline of a Social Systems Perspective, Wiesbaden: Deutscher Universitäts-Verlag, →ISBN, page 84
2. (transitive) To undo a sharpening operation on (an image).
   • When it sharpens the image, you can't unsharpen it again without losing data.2012, Haje Jan Kamps, Focus on Travel Photography, page 91