be perfectly calm and collected be in possession of oneself with great presence of mind not turn a hair undismayed unflappable with great composure without turning a hair
be perfectly calm and collected
undismayed
英 [ˌʌndɪsˈmeɪd]
美 [ˌʌndɪsˈmeɪd]
unflappable
英 [ˌʌnˈflæpəbl]
美 [ˌʌnˈflæpəbl]
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