Tentatively

adv. [f. TENTATIVE a. + -LY².] In a tentative manner; by way of trial or experiment; experimentally.

1588.  J. Harvey, Disc. Probl., 7. But to put the case, and … to proceede tentatiuely, and discoursiuely, as the foresaid schoolemen vse to call it.

1637.  Jackson, 3rd Serm., Jer. xxvi. 19. Wks. 1844 VI. 95. He said it solemnly and publicly, not tentatively or by way of trial only.

1874.  Green, Short Hist., iv. § 2. 170. It was only slowly and tentatively that this principle was applied.