philosophical
US /ˌfɪl.əˈsɑː.fɪ.kəl/
UK /ˌfɪl.əˈsɑː.fɪ.kəl/

1.
relating or devoted to the study of the fundamental nature of knowledge, reality, and existence.
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He enjoys deep philosophical discussions.
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Her new book explores various philosophical concepts.
2.
having or showing a calm and rational attitude toward life; stoical.
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He remained calm and philosophical despite the setback.
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She took a very philosophical view of the situation.