Sterlingly

adv. [f. STERLING a. + -LY².] In a sterling manner.

1883.  Richmond Enquirer, 30 Oct., 3/6. This is a course … sterlingly characteristic of the wisdom and patriotism of the man.

1883.  W. Jolly, Life J. Duncan, xxxix. 478. So sterlingly honest was he in all things.