encaustically--prophetes.ai

encaustically, adv.
  (ɛnˈkɔːstɪkəlɪ)
  [f. encaustic + -al¹ + -ly².]
  In encaustic.

1857 De Quincey in Page Life (1877) II. xviii. 139 Burnt in, encaustically painted.

Oxford English Dictionary