1, which means different
Quiet: There is no sound.
Quiet: Quiet.
2. Different emphases
Quiet: I can't describe my mood.
Tranquility: describes the inner state.
3, citation usage is different.
Jing: Wen Hui Monthly: "The cicada on the tree sings' cicada knows cicada', and it is quiet everywhere."
Jing: Oriental: "This kind of bird, whether in the early morning when the dew is wet, or in the quiet noon and hazy moonlight night, sounds different."