不知不觉

Explanation: Know: know; sense: awareness. Did not realize that not aware of. Are multi-finger did not notice. 　　Usage: Joint type; as the predicate attribute; describe the unconscious 　　Source: Song Xi "ZHUAIYULE" Volume 120: "sage of the study is scheduled to take by force take by force custom, unwittingly done thoroughly natural." 　　Examples: His cruel and vicious, sometimes ~ exposed in the old man. (Cao Yu, "Wang Zhaojun" Act II) Thesaurus:  spirit guiltless, ghost cannot help, Did not know I do not know, Person without our noticing, dottiness