Wordnet 3.0
ADVERB (1)
1.
in an uncertain groping manner;
The Collaborative International Dictionary of English v.0.48:
Gropingly \Grop"ing*ly\, adv.
In a groping manner.
[1913 Webster]
WordNet (r) 3.0 (2006):
gropingly
adv 1: in an uncertain groping manner