lossy       
adjective  computing, electronics specialized uk/ˈlɒs.i/ us/ˈlɑː.si/
 丢失数据的;损耗电子能量的
involving the loss of data or of electrical energy 
  Lossy file compression results in lost data and quality from the original version. 有损文件压缩会丢失原始文件的数据的质量。 
 Compare: lossless