Crassly

adv. [f. CRASS a. + -LY².] Coarsely; grossly, ‘densely’; see the adj.

1664.  H. More, Myst. Iniq., II. 217. Being so crassly discovered and described.

1883.  Lockyer, in Nature, XXVII. 250. The artist was crassly ignorant of the phenomena he attempted to represent.