な is generally masculine speech, but in this case you can't replace it with ね
for neutral speech of the same meaning. いいね is just 'it's nice', while いいな
implies envy or hope. If they can't say いいな, what would they say instead?
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2015-05-06T07:02:30.177
24155
2015-05-07T02:13:03.207
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question
feminine-speech
Can girls say いいな?
The one, which implies envy or hope is often written `いいなあ`, or even `いいなあ～`
and is absolutely fine for girls. I would almost say, that (especially in the
envy-usage) is more often used by girls than guys, but this is maybe not a
problem of speech, but more a problem of displaying envy via speech.

But there also is a manly `いいな`, but it has a different meaning.
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2015-05-06T07:27:57.507
24156
2015-05-06T07:27:57.507
9538
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answer
In the first place, な is not originally masculine or so.

ね is a version of な when you talk to other people, in other words, when you
talk to yourself, it's nothing for women to use it. It may sound rough only
after you use な in talking to other people.
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2015-05-07T02:13:03.207
24167
2015-05-07T02:13:03.207
4092
24155
answer