*assumptive*

a. [ L. assumptivus, fr. assumptus, fr. assumere. ] Assumed, or capable of being assumed; characterized by assumption; making unwarranted claims. -- As*sump"tive*ly, adv. [1913 Webster]

Assumptive arms (Her.), originally, arms which a person had a right to assume, in consequence of an exploit; now, those assumed without sanction of the Heralds' College. Percy Smith. [1913 Webster]