In a calm, composed, or undisturbed manner; with emotional control and focus.
From 'collected' (adjective meaning 'calm and composed,' from Latin 'colligere' meaning to 'gather' or 'control') plus the adverb suffix '-ly.' The metaphor suggests gathering one's thoughts or emotions.
When someone acts 'collectedly' in a crisis, they're literally gathering their wits—it's a metaphor from 'collect' that shows how calmness involves pulling yourself together and organizing your thoughts rather than letting panic scatter your mind.
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