1. The US arms package has " undoubtedly vitiated the atmosphere for bilateral military relations and gravely jeopardized China's national security ".
2. These attacks have vitiated the atmosphere, soured bilateral relations and aggravated political tension between the two countries.
adj
1. ruined in character or quality
2. 911查询·英语单词
2. impaired by diminution
Synonym: diminished lessened weakened