Fetching details from the dictionary...

intimate; close
彼は私にとって最も近しい友人だ。
He is my closest friend.
学生時代は彼と近しかったが今は疎遠だ。
I was close with him during our school days, but now we've drifted apart.
初対面の相手とはまだ近しくない。
I'm not yet close with someone I've just met.