Formal:
* Avoid: This is the most neutral and general word.
* Eschew: This implies a conscious and deliberate decision to stay away from something, often for moral or ethical reasons.
* Shun: This suggests a strong aversion or dislike, often leading to social isolation.
* Abstain: This specifically implies refraining from something, often a habit or indulgence.
Informal:
* Stay away from: This is a straightforward and direct way to say it.
* Keep your distance: This suggests caution and a desire to avoid potential danger or conflict.
* Give it a wide berth: This implies staying far away from something, often due to its negative reputation or potential for trouble.
* Back off: This is a more assertive way to say "stay away."
* Leave it alone: This suggests that something is not worth getting involved with.
The best word to use will depend on the specific context and the level of formality you want to convey.