I can never articulate my thoughts into words, which makes me appear very stupid.

我决对做不到将自己的想法转变成文字，这使我看起来很愚蠢。

youdao

The stupid friend of the detective, the Watson, must not conceal any thoughts which pass through his mind; his intelligence must be slightly, but very slightly, below that of the average reader.

侦探的笨蛋朋友，比如华生，必须将其判断毫无保留地告诉读者，此人的智力须轻微低于读者的平均水平。

youdao

Instead of accepting this explanation, I let pride and ego get in the way and stay angry for several hours, with thoughts like "how stupid could he be?"

我没有接受他的解释，取而代之的是想到自我和自尊，并且气了好几个小时，不停地想着“他怎么这么蠢呢？”

youdao