Sentence examples for a very deep acquaintance from inspiring English sources

The phrase "a very deep acquaintance" is correct and usable in written English.
It can be used to describe a strong or profound level of familiarity or knowledge about someone or something.
Example: "After years of working together, I can say that we have developed a very deep acquaintance that goes beyond mere professional interactions."
Alternatives: "a profound familiarity" or "a strong connection".