What is an antonym for whereas?

There isn't a single perfect antonym for "whereas" because it depends on the context. Here are a few options depending on the meaning you want to convey:

If "whereas" is used to contrast:

* And

* Also

* Furthermore

* Moreover

* Similarly

* Likewise

If "whereas" is used to show a difference:

* On the other hand

* However

* Nevertheless

* Despite

* In contrast

* Conversely

Example:

* Original: "Whereas the first study found a positive correlation, the second study found a negative correlation."

* Using "and": "The first study found a positive correlation, and the second study found a negative correlation."

* Using "however": "The first study found a positive correlation, however, the second study found a negative correlation."

The best antonym will depend on the specific situation and the meaning you want to express.