guiltily

from WordNet (r) 3.0 (2006)
guiltily
    adv 1: in the manner of someone who has committed an offense;
           "she blushed guiltily as she spoke"
    
from The Collaborative International Dictionary of English v.0.48
Guiltily \Guilt"i*ly\ (g[i^]lt"[i^]*l[y^]), adv.
   In a guilty manner.
   [1913 Webster]
    

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