the less said, the better

the less said, the better

It is best to say as little about a difficult or unfortunate topic or situation as possible (to avoid making it worse or dwelling on it for too long). Can also be structured as "the less said about (something), the better." And when it comes to the company's previous failed product, well, the less said, the better. Look, I don't like their plan either, but moping about it won't solve anything. The less said about it, the better.
See also: better, less
Farlex Dictionary of Idioms.

less said (about something), the better

Prov. A way of indicating that you think something should not be talked about any further. Jane: How are things going with your divorce proceedings? Ellen: The less said, the better. The less said about my financial situation, the better.
See also: better, less, said
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

the less/least said, the ˈbetter

(saying) it is better in a difficult situation to say nothing or very little, because otherwise you might make it worse: He’s very angry and she’s very upset, so don’t say anything about cars or accidents. Remember, the less said, the better.
See also: better, least, less
Farlex Partner Idioms Dictionary
See also:
  • less said , the better
  • the least said, the better
  • the less/least said, the better
  • best of a bad bargain, to make the
  • be not (one's) day
  • be the pits
  • a sad state (of affairs)
  • sour note
  • things will work out
  • a sorry state (of affairs)