The expression is 'to say the least', and your example does not demonstrate an understanding of its use. A: What do you think of the clerk? B: Well, I'm not sure, but he's not very polite, to say the least.
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MrPernicketyB: I think he is an obnoxious, arrogant, self-centered SOB, toI would only add that if you diduse that sentence, that would mean that the adjectives you used to describe him are "mild" in comparison to other adjectives that could be accurately used to describe him even motellsay the least