Unable to be upset or excited; remaining calm and composed under pressure. Describes someone who maintains emotional stability regardless of circumstances.
From Latin 'imperturbabilis,' from 'in-' (not) + 'perturbare' (to disturb thoroughly), from 'per-' (thoroughly) + 'turbare' (to disturb). Literally means 'not able to be thoroughly disturbed.'
Break it down: 'im-' (not) + 'perturb' (disturb) + '-able' = not able to be disturbed. Think of someone so unflappable that even a fire alarm wouldn't ruffle their feathers — they'd calmly walk to the exit while others panic.
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