What is an antonym for the word concerned?

There are several antonyms for the word "concerned," depending on the context:

If "concerned" means worried or anxious:

* Unconcerned

* Indifferent

* Relaxed

* Calm

* At ease

If "concerned" means interested or involved:

* Uninterested

* Apathetic

* Disengaged

* Detached

* Uninvolved

If "concerned" means relating to something:

* Unrelated

* Irrelevant

* Extraneous

The best antonym will depend on the specific meaning of "concerned" in the sentence you're using it in.