formal
: very calm : very hard to disturb or upset
Although he seems outwardly imperturbable, he can get very angry at times.
an imperturbable demeanor/disposition
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“Imperturbable.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/imperturbable. Accessed 16 Apr. 2026.
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