In a manner relating to or characteristic of existentialism; from the perspective of existentialist philosophy.
From existentialistic with the adverbial suffix -ally. This creates a way to describe how something is done or understood through an existentialist lens.
If you approach life existentialistically, you're saying 'I create my own meaning and I'm responsible for my choices'—rather than blaming circumstances or saying 'that's just how things are.'
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