Adverb (fukushi), Adverb taking the 'to' particle, Na-adjective (keiyodoshi), Suru verb
trembling (with fear, cold, etc.); shaking; chattering (of teeth)
Onomatopoeic or mimetic word
少し走っただけで膝がガクガクしてるよ。All I did was run a little and now my knees are wobbly. coming loose; wobbling
Onomatopoeic or mimetic word
Also written がくがく