* Niemals - This is the most common and general translation of "never."
* Nie - This is also a common translation, and is often used in negative sentences.
* Keineswegs - This translates to "by no means" or "not at all," and is used to emphasize the "never" aspect.
* Auf keinen Fall - This translates to "in no case" and is similar in meaning to "keineswegs."
Here are some examples:
* Ich werde niemals aufgeben. (I will never give up.)
* Sie hat nie etwas Schlechtes getan. (She has never done anything bad.)
* Das ist keinesfalls wahr. (That is by no means true.)
* Auf keinen Fall werde ich ihm helfen. (In no case will I help him.)
The best translation will depend on the specific context and the level of formality you want to convey.