like sin vs like crazy

like sin and like crazy both are adverbs.

Word	Noun	Adjective	Verb	Adverb
like sin	No	No	No	Yes
like crazy	No	No	No	Yes

As adverbs, like sin and like crazy are synonyms defined as:

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

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

like sin (adverb)	like crazy (adverb)
(informal) with great speed or effort or intensity; used for emphasis	(informal) with great speed or effort or intensity; used for emphasis