Search Result for "invisibly": 
Wordnet 3.0

ADVERB (1)

1. without being seen;
- Example: "these organisms enter the body invisibly"



The Collaborative International Dictionary of English v.0.48:

Invisibly \In*vis"i*bly\, adv.
   In an invisible manner. --Denham.
   [1913 Webster]


WordNet (r) 3.0 (2006):

invisibly
    adv 1: without being seen; "these organisms enter the body
           invisibly" [ant: visibly]