难言之隐

Explanation: Hidden in the heart causes inconvenience to say or do. 　　Usage: Partial official; as object; 　　Source: Qing Qian, "Postscript to stay Om": "Qian little as party leader, asked later Zen, life quite a lot of One Yu hiding something." 　　Riddle: Charades Thesaurus:  secret act, unable to give a convincingexplanation for self-defense, A mouth Nanbian, Tibetan monkeys Mountain, Stealthy, Peru without speaking, stick in one's throat, A mouth wordless, Bitter wordless, There I was difficult to separate