I'm looking for an adjective that describes not concentrated.
Something like "flying around", "not really here".
In hebrew it would've been מעופף.
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The definitions are taken from the NOAD and OALD.
How about absent-minded?
Your original question is kind of mistaken. "Not concentrated" generally means "diffuse" or "diluted," but then in your explanation you don't mean "concentrated" in that sense. Concentrated almost always refers to the purity of some substance (especially a liquid) while you are talking about mental focus. In that case what you wanted to say is "not concentrating."
(Of a person) disorganized and lacking in concentration.