[のうあるたかはつめをかくす, nouarutakahatsumewokakusu] (exp) (id) a wise man keeps some of his talents in reserve; one shouldn't show off; the person who knows most often says least; a skilled hawk hides its talons
[やくしゃばか, yakushabaka] (n) good actor who is inept in all other matters; demon for acting who is utterly indifferent to all other concerns; skilled actor who knows little of life; person who excels in one occupation (profession) but lacks simple common sense
[ろんごよみのろんごしらず, rongoyominorongoshirazu] (exp) a mere scholar, unable to practically use what he has learned; someone who knows a theory, but cannot apply it