pru·den·tial /pruˈdɛn(t)ʃəl/
  (a.)謹慎的,細心的,明辨的
  Pru·den·tial a.
  1. Proceeding from, or dictated or characterized by, prudence; prudent; discreet; sometimes, selfish or pecuniary as distinguished from higher motives or influences; as, prudential motives. “ A prudential line of conduct.”
  2. Exercising prudence; discretionary; advisory; superintending or executive; as, a prudential committee.
  Pru·den·tial, n. That which relates to or demands the exercise of, discretion or prudence; -- usually in the pl.
     Many stanzas, in poetic measures, contain rules relating to common prudentials as well as to religion.   --I. Watts.
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  prudential
       adj : arising from or characterized by prudence especially in
             business matters; "he abstained partly for prudential
             reasons"