I'd call it an adverb. There is a group of non-ly degree adverbs that 
often modify adjectives. Many of them have a somewhat informal register 
and so probably wouldn't be acceptable in formal writing. Compare "dead 
wrong," "mighty nice," and "pretty good". For some non-ly adverbs in the 
same position that are standard in even the most formal registers, 
compare "altogether silly," "rather famous," and "quite annoying."

For more, see the Cambridge Grammar of the English Language, p. 584.

On 1/14/2013 7:10 PM, Scott Woods wrote:
> Dear List,
>
> In the sentence "The sun is usually blazing hot," how would you 
> analyze "blazing"?
>
> Thanks,
> Scott
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