Valmiki Ramayana Sundara Kanda Sarga 5 Shloka 24

सनातने the eternal, वर्त्मनि on the path, सन्निविष्टाम् abiding, रामेक्षणाम् a lady of beautiful eyes, मदनाभिविष्टाम् overwhelmed by love, श्रीमत् prosperous, भर्तुः husband's, मनः in mind, अनुप्रविष्टाम् ever established, वराभ्यः compared to the choicest women, स्त्रीभ्यश्च compared to wives, सदा ever, विशिष्टाम् a distinguished demoness, ताम् her, न ददर्श not seen.

'Sita must have had a pair of beautiful eyes. She must have been a passionate lady with mind fixed on her glorious husband. Ever established in dharma, she is perhaps a distinguished lady compared to her counterparts (in Lanka).