A pure-hearted, naive, or innocent disposition; straightforward and unsophisticated feelings (often used about romantic feelings).
彼は純情な人で、人の悪口は言わない。
He is a pure-hearted person and doesn't speak ill of others.
純情な若者が初恋で戸惑う場面が描かれている。
The scene depicts a pure-hearted young person confused by first love.
彼女の純情さに周囲の人が心を動かされた。
People around her were moved by her innocence.