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You can remove a negative keyword list from one campaign at a time.

1. Click the Campaigns tab.
2. Click the campaign that you'd like to remove the negative keyword list from.
3. Click the Keywords tab.
4. Click Negative keywords.
5. In the “Campaign level” table, click Lists on the right. 
6. Select the checkbox next to the keyword list you'd like to remove.
7. Click Remove.

Here's how to remove a negative keyword list from all campaigns that use it:

1. Click the Campaigns tab.
2. Click the Shared library link in the left navigation bar.
3. Click Campaign negative keywords and then click the list you'd like to remove.
4. Scroll to the campaign table and select the checkbox next to each campaign that shares this list. Then, click Remove list from selected to remove this list from all of the campaigns that share it.
5. Click Campaign negative keywords in the left navigation bar, and then select the checkbox next to the list that you'd like to remove.
6. Click Remove.

Try it out