童ㄊㄨㄥˊtóng叟ㄙㄡˇsǒu無ㄨˊwú欺ㄑㄧqī

對待小孩和老人的態度一樣，不會欺瞞。《二十年目睹之怪現狀·第五回》：「他這是招徠生意之一道呢！但不知可有貨真價實，童叟無欺的字樣沒有？」

英cheating neither old nor young (idiom); treating youngsters and old folk equally scrupulously, Our house offers sincere treatment to all and fair trade to old and young alike.