having far too many things in an untidy way

 in bad condition and not cared for

5 letters having a lot of dust

d...

 very dirty and unpleasant synonym of sordid

does not have enough space for people to be in it

6 letters covered with mould or containing it.

m...

in bad condition due to use. Synonym of scruffy

in very bad condition and in need of repair

not bright

unpleasant because there is a lot of air coming in

of furniture or parts of buildings weak, old and likely to break

unpleasant and or poor quality