Hard to rattle

This time we are looking on the crossword clue for: Hard to rattle.
it’s A 14 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: SERENE, CALM.

Last seen on: –The Washington Post Crossword – Jan 22 2021
LA Times Crossword 22 Jan 21, Friday
USA Today Crossword – Jan 12 2019