like crazy vs like sin

like crazy and like sin both are adverbs.

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

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

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

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

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