直：性格上的说话、做事直接达到目的，没有任何修饰。 楞：说话做事不经过思考，随意的就说出或者做出来，造成不好的后果和影响。

The translation above is perfect. I want to add that this expression and the word"楞" are not commonly used in Mandarin. It is more like a dialect in north area of China. I guess you come across it from some drama lines or novels ?

YOU ARE NOT STRAIGHT AT ALL. IN FACT, YOU ARE STUPID. 直: 率直的 坦白的 愣: 痴呆的 (愣= 楞)

在中国，说话办事讲究和事宜，识时务。同样是一句真话、直话，在有些场合情形下说出来，效果会大相径庭。而执拗去说，就显得有些楞(不识时务而显得有点傻)一般而言，这句话不是对比人性格的批评，而是一种处事方法的劝诫。Beth你不要多心。

oh..it's not about country...it's the only one world on internet...I am sorry somebody said that to you....楞 means rash and impetuous