"existentialist" in the noun sense
1. existentialist, existentialist philosopher, existential philosopher
a philosopher who emphasizes freedom of choice and personal responsibility but who regards human existence in a hostile universe as unexplainable
"existentialist" in the adjective sense
1. existentialist
relating to or involving existentialism
"existentialist movement"
"existentialist philosophy"
"the existentialist character of his ideas"
Source: WordNet® (An amazing lexical database of English)
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