student asking question

What's "serious" mean here?

teacher

Native speaker’s answer

Rebecca

Here, "serious" means worrying or critical. That something can possibly be dangerous or risky! So here, he's saying that a jellyfish sting can be quite dangerous and worrying, perhaps if not treated well or immediately. Ex: Rachel didn't get serious injuries while skateboarding. She just got a few minor scratches. Ex: A break-in sounds quite serious.

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