Meanings
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1
adv
in a peacefully serene manner
I had the feeling that they were waiting, too--serenely patient.
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2
adv
In a serene manner.
1923, Ernest Bramah, The Eyes of Max Carrados The dials are all bunkum. While you were playing I took the liberty of altering them and for a whole hand the dials indicated that you must inevitably be holding eight clubs and four spades. All the time you were leading out hearts and diamonds and the automaton serenely followed suit.
Etymology
From serene + -ly.