Fetching details from the dictionary...

inexperienced (in life experience); unsophisticated; green; wet behind the ears
inexperienced (in love); innocent; naive; simple
「初」 has other readings with different meanings.
彼女はうぶで恋愛の経験がほとんどない。
She's inexperienced and has almost no dating history.
都会に出たばかりの彼はまだうぶだった。
Having just come to the city, he was still naive.
都会育ちなのにうぶなところがあって周りに好かれている。
Despite growing up in the city, she has a naive side that people like.