* Instead of: This is a direct opposite, meaning "in place of" something else.
* In addition to: This means something is being provided *along with* something else, rather than in place of it.
* Because of: This implies that something is happening due to something else, rather than as a replacement.
* In conjunction with: This suggests that something is happening together with something else.
For example:
* In lieu of: "In lieu of a raise, we'll offer you extra vacation time."
* Instead of: "Instead of a raise, we'll offer you extra vacation time."
* In addition to: "In addition to your raise, we'll offer you extra vacation time."
* Because of: "Because of the company's financial situation, we'll offer you extra vacation time instead of a raise."
The best opposite for "in lieu of" will depend on the specific situation and the intended meaning.