to say nothing of

1.
General Englishneutral
- Used to introduce an additional, often more significant, fact or example that reinforces or amplifies the preceding statement.
- Not to mention; moreover; in addition to what has already been said.
2.
General Englishneutralformal
- Used to emphasize that something else, typically more extreme or problematic, should be considered but is left unspoken.
- Let alone; used to indicate that the second item is even less likely or more pertinent than the first.

Examples: