This is the 9667th most frequent Japanese word.
至って
"Extremely; very; exceedingly."
In this context, "至って" means "extremely" or "very much so," emphasizing the degree of politeness attributed to the described person.
彼は至って礼儀正しい人です。
He is an extremely polite person.
Here, "至って" conveys the meaning of "absolutely" or "completely," stressing the sheer normalcy of the lifestyle in question.
至って普通の生活を送っています。
I lead a completely ordinary life.
In this sentence, "至って" serves to heighten the seriousness being described, suggesting an "extremely" or "very" significant condition.