pre·sump·tive /-ˈzʌm(p)tɪv/
 (a.)根據推定的,假定的,給與推定之根據的


 presumptive
 推測


 Pre·sump·tive a.
 1. Based on presumption or probability; grounded on probable evidence; probable; as, presumptive proof.
 2. Presumptuous; arrogant. [R.]
 Presumptive evidence Law, that which is derived from circumstances which necessarily or usually attend a fact, as distinct from direct evidence or positive proof; indirect or circumstantial evidence. “Presumptive evidence of felony should be cautiously admitted.” --Blackstone. The distinction, however, between direct and presumptive (or circumstantial) evidence is now generally abandoned; all evidence being now more or less direct and more or less presumptive.
 Presumptive heir. See Heir presumptive, under Heir.

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 presumptive
      adj 1: having a reasonable basis for belief or acceptance; "the
             presumptive heir (or heir apparent)"
      2: affording reasonable grounds for belief or acceptance;
         "presumptive evidence"; "a strong presumptive case is made
         out"