What is the synonym for indifferent?

There are many synonyms for "indifferent", depending on the specific nuance you want to convey. Here are some options:

Neutral:

* Apathetic

* Uninterested

* Unconcerned

* Unmoved

* Impassive

* Detached

* Nonchalant

Negative:

* Cold

* Aloof

* Distant

* Uncaring

* Callous

* Insensitive

* Unfeeling

Other:

* Ambivalent (having mixed feelings)

* Neutral (having no strong preference)

* Unbiased (not favoring one side over another)

The best synonym will depend on the context of your sentence. For example, if you want to convey that someone is not interested in something, "uninterested" would be a good choice. If you want to convey that someone is completely uncaring, "callous" might be more appropriate.