Valmiki Ramayana Sundara Kanda Sarga 13 Shloka 51
Original Shlokaइति चिन्तां समापन्नः सीतामनधिगम्य ताम्।।5.13.51।। ध्यानशोकपरीतात्मा चिन्तयामास वानरः।
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वानरः vanara, ताम् her, सीताम् Sita, अनधिगम्य unable to find, इति thus, चिन्ताम् worry, समापन्नः distressed, ध्यानशोकपरीतात्मा whose mind was overcome with anxiety, चिन्तयामास started thinking further.
Distressed over his inability to find Sita, Hanuman's mind was overcome with anxiety and he started thinking further.