detestably

from WordNet (r) 3.0 (2006)

detestably
    adv 1: in an offensive and hateful manner; "I don't know anyone
           who could have behaved so abominably" [syn: {detestably},
           {repulsively}, {abominably}, {odiously}]

from The Collaborative International Dictionary of English v.0.48

Detestably \De*test"a*bly\, adv.
   In a detestable manner.
   [1913 Webster]

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