inattentive vs careless

inattentive and careless both are adjectives.

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

inattentive (adjective)	careless (adjective)
showing a lack of attention or care	marked by lack of attention or consideration or forethought or thoroughness; not careful
not showing due care or attention	effortless and unstudied
	(usually followed by `of') without due thought or consideration