What means 'low key approach'?

Sentence 1. Phil Bengstons low key approach was in sharp contrast to the often-volatile Lombardi.Sentence 2.Phil Bengstons low key approach blended we

Sentence 1.
Phil Bengston's low key approach was in sharp contrast to the often-volatile Lombardi.
Sentence 2.
Phil Bengston's low key approach blended well with the fiery Lombardi.

Does 'low key approach' mean 'calm'? or 'have the humility'?

or:Sentence 1. Phil Bengston's low key approach was in sharp contrast to the often-volatile Lombardi.Sentence 2.Phil Bengston's low key approach blended well with the fiery Lombardi.Does 'low key approach' mean 'calm'? or 'have the humility'?

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