Exhausted

It is 15h23 as I write this post, I cannot say my body is exhausted as I have been sitting on my ass all day but I can say, with certainty, my brain is exhausted and I have got to figure this out.  
It is such an expressive word, I am not tired, not flat but EXHAUSTED
Those shoes you are wearing are not last season, no out fashion, not passé but rather EXHAUSTED