adj. worldly; as opposed to spiritual; existing for a time only
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Temporal
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Rueful
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Radical
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Indigenous
A
Correct answer
Explanation
Temporal means relating to worldly or material affairs rather than spiritual ones, and also means lasting only for a time (temporary, transient). This perfectly matches the definition provided. Rueful means regretful, radical means extreme, and indigenous means native - none fit the temporal/secular meaning.