Valmiki Ramayana Yuddha Kanda Sarga 21 Shloka 12

प्रयतेन though selfrestrained, रामेण by Rama, यथार्हम् according to propriety, अभिपूजितः well respected, अपि also, मन्दः dull, सागरः the ocean, रामस्य to Rama, रूपम् real form, नचदर्शयते did not show.

Though Rama remained selfrestrained and respected the ocean well according to propriety, the ocean was dull and did not show its real form.