careless vs slapdash

careless and slapdash both are adjectives.

Word	Noun	Adjective	Verb	Adverb
careless	No	Yes	No	No
slapdash	No	Yes	No	Yes

careless (adjective)	slapdash (adjective)
marked by lack of attention or consideration or forethought or thoroughness; not careful	marked by great carelessness
effortless and unstudied
(usually followed by `of') without due thought or consideration

careless (adverb)	slapdash (adverb)
	in a careless or reckless manner
	directly