I'm looking for an adjective that describes not concentrated.
Something like "flying around", "not really here".
In hebrew it would've been מעופף.
The definitions are taken from the NOAD and OALD.
I think a more simple word would go in this context and the right word to use (if you were to translate מעופף ) would be "daydreamer". You can say "He's such a daydreamer"
How about absent-minded?
I can think of:
spacey |ˈspeɪsi| (also spacy)
adjective (spacier |ˈspeɪsiər|, spaciest |ˈspeɪsi1st|) informal
out of touch with reality, as though high on drugs : I remember babbling, high and spacey.
• (of popular, esp. electronic music) drifting and ethereal.
If the person is thinking of something else, or engrossed in an activity, we say
He is preoccupied. If the person is engrossed in a memory, we say,
She is a million miles away.
Without more context it won't be easy to help, but "loose" is a fairly catch-all term for things that are not condensed. If you mean "not concentrating," then "distracted," etc., as given by others.
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.
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?