Miserable mulberry -morus nigra

I'd say it is planted too close to the wall. Its roots are probably up against the foundations meaning it is not getting enough water and is struggling with the rubbish that is often left near walls.

It may be too stressed at this stage, but I suggest you water it well then lift it with a good spadeful of soil and put it somewhere in the shade and cover the roots. Dig a decent hole a good foot away from the wall and check you are clear of the foundations and there is no old cement rubbish. Put in some John Innes compost (soil based compost) then carefully replace the plant making sure there is no rubbish embedded in the soil. Tuck it in carefully with some more compost if necessary and firm it in gently. Water it some more and continue to water it depending on the weather.

You could cut off a few of the more sad looking leaves and possibly give it a foliar feed to help it get going.