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Use "unrattled" in a sentence
"Tebow appeared poised and confident—unrattled by his opponent or the absurd expectations thrust upon him over two months."
"When people are paying for a luxury cruise, they tend to be demanding but these guys remained unrattled no matter what request was thrown at them."
"I was amazed how unrattled she was by their noise and perpetual motion, though from time to time she looked apprehensive, as if she expected them to turn into vicious little monsters, like the Mogwais in Gremlins."