How do you use the word nethertheless in a sentence?

The word you're thinking of is "nevertheless", not "nethertheless". Here's how you can use it in a sentence:

* "The weather was terrible, nevertheless, we decided to go for a walk."

This sentence shows that even though the weather was bad, they still went for a walk.

"Nevertheless" is used to introduce a contrasting idea or statement, indicating that something happened despite something else.