A doltish love letter would prompt your lover to ditch you.

一封愚钝直白的情信会让你的情人弃你而去。

"Thinker" is rather an ironic moniker for someone as doltish as you?

你绰号叫“思考者”？真讽刺，你这么蠢。(译者注：上条评论是名为“思考者”的)？

Now he must deal with Washington's gigantic and frequently doltish permanent establishment.

但是现在他必须和华盛顿的庞大但有点愚蠢的既有体制打交道了。