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.
by mplsrae July 16, 2018
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describing someone that is in a normal emotional state; not too happy or depressed
"Bob was telling me about that painful breakup he went through a while ago, but it seems like he's even keel now."
by Bungalow Bill September 4, 2007
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