Looking on how to improve my essays, I've just come across the idiom 'speaks volumes about'. For example:
The unsightly yard and unpainted house speaks volumes about what kind of people live there.
However, all the examples I've seen use it in kind of informal way. Would it be valid to be included in a formal essay?
PS: One example of a formal use would be writing to your college director to do some proposal to improve building's installations:
The anual asset from the magazine has given an outstanding review of the college, which speaks volumes about it. However...