like mad vs like hell

like mad and like hell both are adverbs.

Word	Noun	Adjective	Verb	Adverb
like mad	No	No	No	Yes
like hell	No	No	No	Yes

As adverbs, like mad and like hell are synonyms defined as:

like mad and like hell: (informal) with great speed or effort or intensity; used for emphasis

Other synonyms of like mad include like crazy, like sin, like the devil, like thunder.

like mad (adverb)	like hell (adverb)
(informal) with great speed or effort or intensity; used for emphasis	(informal) with great speed or effort or intensity; used for emphasis
	used ironically to indicate the opposite of what is stated