वानराधिपः (अपि सन्) king of the monkeys, सः सुग्रीवः that Sugriva, ते by you, नावमन्तव्यः not to be insulted, कृतज्ञः a grateful one, कामरूपी च he can take any form at will, सहायार्थी च he seeks your help, वीर्यवान् strong.

Thinking that Sugriva is only a vanara king, he should not be disrespected. He has a sense of gratitude. He can take any form at will. He is in need of your help although he is very strong.