The Collaborative International Dictionary
Assumptively
Assumptive \As*sump"tive\, a. [L. assumptivus, fr. assumptus, fr. assumere.] Assumed, or capable of being assumed; characterized by assumption; making unwarranted claims. -- As*sump"tive*ly, adv.
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.
Wiktionary
assumptively
adv. In an assumptive manner.