Wordnet 3.0
ADVERB (1)
1.
in an impassive manner;
- Example: "he submitted impassively to his arrest"
The Collaborative International Dictionary of English v.0.48:
Impassive \Im*pas"sive\, a.
Not susceptible of pain or suffering; apathetic; impassible;
unmoved.
[1913 Webster]
Impassive as the marble in the quarry. --De Quincey.
[1913 Webster]
On the impassive ice the lightings play. --Pope.
-- Im*pas"sive*ly, adv. -- Im*pas"sive*ness, n.
[1913 Webster]
WordNet (r) 3.0 (2006):
impassively
adv 1: in an impassive manner; "he submitted impassively to his
arrest"