Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 32
Original Shlokaदुधुवे च स रोमाणि चकम्पे चाचलोपमः। ननाद सुमहानादं सुमहानिव तोयदः।।5.1.32।।
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अचलोपमः huge as mountain, सः he, रोमाणि hair, दुधुवे shook, चकम्पे च and moved, सुमहान् great, तोयदः इव like a cloud, सुमहानादम् huge sound, ननाद produced.
Hanuman, huge as a mountain moved his body and shook the hair on his body, thundering like a cloud.