半信半疑

Explanation: Half: half; letter: I believe; doubt: doubt. Some believe that they have some doubts 　　Usage: Joint type; as predicate, attributive, adverbial; describe the non-letter like the letter, not sure 　　Source: Song Xi "ZHUAIYULE" Volume 36: "If they heard, doubtful, if the deposit if the death, An Debu lazy?" 　　Examples: Although we are saying, he was ~. 　　Riddle: Guess letter Thesaurus Group:  Suspect letter half, Non letter like the letter suspicious