When a person's emotions are under control, balanced and steady.
Keel is nautical for the underneath of a watercraft that floats on water, like a ship that's going with the flow. And, even can mean smooth, so even keeled means the person is like floating through life in a smooth and even manner
The class bullies tried to get Ben to react to their taunting, but he remained even keeled, steady and as cool as a cucumber.
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