The Collaborative International Dictionary of English v.0.48:

Loathe \Loathe\ (l[=o][th]), v. t. [imp. & p. p. Loathed
   (l[=o][th]d); p. pr. & vb. n. Loathing.] [AS. l[=a][eth]ian
   to hate. See Loath.]
   1. To feel extreme disgust at, or aversion for.
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            Loathing the honeyed cakes, I Ionged for bread.
                                                  --Cowley.
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   2. To dislike greatly; to abhor; to hate; to detest.
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            The secret which I loathe.            --Waller.
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            She loathes the vital sir.            --Dryden.

   Syn: To hate; abhor; detest; abominate. See Hate.
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The Collaborative International Dictionary of English v.0.48:

Loathing \Loath"ing\, n.
   Extreme disgust; a feeling of aversion, nausea, abhorrence,
   or detestation.
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         The mutual fear and loathing of the hostile races.
                                                  --Macaulay.
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WordNet (r) 3.0 (2006):

loathing
    n 1: hate coupled with disgust [syn: abhorrence,
         abomination, detestation, execration, loathing,
         odium]