innocent, simple / unsophisticated, artless

innocence / unsophistication, naïveté

character of human (personality), or of things.

I'm in love with you; I love you

to love

(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

interrogative personal pronoun: who, whom

(archaic) interrogative personal pronoun: who, whom