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is there a good expression for the English "a moment of weakness"?

For example: In a moment of weakness, I strayed from my diet and ate some
cookies.

I tried looking through alc but couldn't really find anything that seemed to
sound right.
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2017-06-25T13:38:26.060
48737
2017-06-28T22:37:34.923
1805
question
translation
How to say "moment of weakness"?
Depending on context, I think you could probably say...

> 「誘惑に負けて、（つい）...」  
>  「 （つい）魔が差して、...」  
>  「一時の気の迷いで...」

* * *

> In a moment of weakness, I strayed from my diet and ate some cookies.

ダイエット中なのに、誘惑に負けてついクッキーを食べてしまった。
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2017-06-25T15:57:10.730
48740
2017-06-25T15:57:10.730
9831
48737
answer
よわったな。

彼女の作り立てのクッキーのその[暖かい香り]{あたたかいかおり}に［まけて・よわって］味見をしました。

(Either one will work there, I think.)

~~「心を[緩めた]{ゆるめた}瞬間{しゅんかん}」 might work for more abstract temptations.~~ Or
maybe it was 「よろめく」, although the grammar would be different. ~~I think I've
heard both, but you'll want to check. But either way has a certain
philosophical feeling. The latter is definitely used relative to temptation,
in addition to meaning physically losing of balance (but not 「心を」 in that
case).~~

(I'm going to retract those. I may use them, but I wouldn't recommend them
unless you hear a native using them, and you may still want to check twice.
However, I recalled another, see below.)

It depends on what sort of weakness you are blaming. You're more likely to
hear excuses than "in a moment of weakness".

~~腹経て(はらへて)~~ [腹減って]{はらへって}、クッキーを三枚[食っちゃった]{くっちゃった}。

or

[お腹空きすぎ]{おなかすきすぎ}、食べちゃったのよ。

(ahem. [弱った隙に]{よわったすきに}打った誤字のことを、chocolate様にご指摘を頂いて、感謝します。 But there is a
sense of a contest in progress with 「弱った隙に」.)

(afterthought #2) Since I'm being too cryptic, the English in the question
really doesn't translate well in actual use.

However, I did recall a phrase that is close, 「弱った隙に」, which I used in the
example of the first afterthought. It may or may not be appropriate, which I
tried to demonstrate by the example and the comment.

(end-afterthought)
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2017-06-26T03:07:15.367
48750
2017-06-28T22:37:34.923
2017-06-28T22:37:34.923
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answer