After missing an appointment, which would be more appropriate for asking for
forgiveness or apologizing?

> ごめんなさい でした

or

> 本当にごめんね。ほんとうに ごめんね

In particular, considering the difference between the two, which would be
better to use for a 先生?
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2019-02-17T18:49:20.037
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2019-02-18T00:34:35.757
2019-02-18T00:34:35.757
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question
nuances politeness
Polite form of apology with tense form?
In this context, the best is:

> > 申｛もう｝し訳｛わけ｝ありませんでした。 I'm very sorry (lit. 'there was no excuse').
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2019-02-17T21:24:43.620
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2019-02-17T21:24:43.620
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answer