† Asseverantly

adv. Obs. [f. prec. + -LY². Cf. L. assevērānter.] By way of asseveration.

c. 1555.  Harpsfield, Divorce Hen. VIII. (1878), 122. Not spoken asseverantly but opinionatively, and by the way of allegation.

1600.  Abp. Abbot, Exp. Jonah, 562. To speak an untruth voluntarily and asseverantly, had been a shameful thing.