“That one's not appropriate for children.”
You're at a video rental store with your children. You told them they could choose a video to rent, but they picked out a violent horror movie. You want to tell them that they can't watch the movie. And you want to say it in a way that sounds adult, so that your children don't think that you're talking down to them.
That one's not appropriate for children.
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When you say that something is "not appropriate", it means that it's bad. But the word "bad" means that something isn't good in any situation, while "inappropriate" means "bad" for a specific situation. You tell what situation you're talking about with "for ___". For example:
Did you see what she's wearing? That's really not appropriate for work.
You can also follow "appropriate" with "to (do)":
That's a good song, but it's not appropriate to play at a wedding.
The word "appropriate" is intellectual- and adult-sounding.