adjective
describing the intensity of anger
adverb
modifying the adjective 'mad' to indicate the degree of anger
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She was as mad as hell when she found out about the accounting error.
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I was as mad as hell when my sister ate my leftovers without asking.
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My boss was mad as hell when he caught us slacking off at work.
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The protesters were as mad as hell about the government's decision to cut funding for education.