—used to say that something is very large or very great The importance of tomorrow's test cannot be overstated.

Can never be overestimated?

The phrase “cannot be overestimated” is as same as “can't be exaggerated.” In other words, it is used when something or someone is getting over-significance or importance than it really deserves, or that it is winning way too much of attention than it deserves.

Can hardly be overestimated meaning?

If you say that something cannot be overestimated, you are emphasizing that you think it is very important. [emphasis] The importance of participating in the life of the country cannot be overestimated. [ be VERB-ed] It is hard to overestimate the potential gains from this process. [