The difference between Cool-headed and Even-tempered
When used as adjectives, cool-headed means calm and imperturbable, especially under pressure, whereas even-tempered means remaining calm even in situations that would cause many others to become angry, frustrated, panicky, etc.
check bellow for the other definitions of Cool-headed and Even-tempered
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Cool-headed as an adjective:
Calm and imperturbable, especially under pressure.
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Even-tempered as an adjective:
Remaining calm even in situations that would cause many others to become angry, frustrated, panicky, etc.