"Don't say it, if you don't want to" in Japanese

Question

Don't say it, if you don't want to.

You don't have to say it, if you don't want to.

How do I convey these in Japanese correctly?

My idea is 言えないこと言ってないもいいです。

But I am really confused by verb conjugation here.

Don't say it = iwanai? ienai?

Don't want to say = ienai? But then it would mean 'I can't say'....

Could you please help in both translation and explanation for these two conjugation forms.

Answer 1

言いたくないなら、言わなくてもいい
lit. If you don't want to say it, you don't have to say it.

Some comments:

• The "don't have to"-form is ~て+もいい, i.e. you have to form the ~て form of the i-adjective 言わない, which is the correct negative for the verb (and not 言ってない).
• The English leaves out the verb the second time, which can't be done in Japanese.

• なら is just one option for "if" (which I think fits best). Other ways to say it would be

  言いたくなければ、…
  言いたくなかったら、…

• 言えない means indeed "can't say" Your (slightly corrected) sentence means

  言えないことを言わなくてもいい
  Things you can't say, you don't have to say.