From The Collaborative International Dictionary of English v.0.44 [gcide]:
Presumptive \Pre*sump"tive\, adjective [Cf. F. pr['e]somptif.]
1. Based on presumption or probability; grounded on probable evidence; probable; as, presumptive proof.
2. Presumptuous; arrogant. [R.] --Sir T. Browne.
{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}.
From WordNet (r) 2.0 [wn]:
adjective
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"
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
94 Moby Thesaurus words for "presumptive": absolute, acceptable, accounted as, adducible, admissible, alleged, apt, assumed, assumptive, attestative, attestive, authentic, based on, believable, certain, circumstantial, conceivable, conclusive, conjectured, convincing, credible, cumulative, damning, decisive, deemed, determinative, documentary, documented, evidential, evidentiary, ex parte, eye-witness, factual, fair, final, firsthand, foreseeable, founded on, given, granted, grounded on, hearsay, hopeful, implicit, in the cards, incontrovertible, indicative, indisputable, inferred, irrefutable, irresistible, justifiable, liable, likely, material, nuncupative, odds-on, overwhelming, plausible, postulated, postulational, predicated, predictable, predictable within limits, predicted, premised, presumable, presumed, probable, probative, promising, putative, rational, reasonable, reliable, reputed, sensible, significant, sound, statistically probable, suggestive, supposed, suppositional, supposititious, suppositive, sure, symptomatic, taken for granted, telling, tenable, understood, valid, verisimilar, weighty
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