The boy was remarkably unperturbed by the terrible news.
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She remained unperturbed by the criticism and continued with her work confidently.
Composed, undisturbed, unruffled, or placid. Those words mean unperturbed.
Calm, unruffled, serene
The sentence, Janet thought Sean's answer was very reassuring, is an example of how to use reassuring in a sentence.
Thankfully, we are all unhurt.
Apple trees are deciduous.