Meaning : Marked by lack of attention or consideration or forethought or thoroughness. Not careful.
Example :
Careless about her clothes.
Forgotten by some careless person.
A careless housekeeper.
Careless proofreading.
It was a careless mistake.
Hurt by a careless remark.
Exercising caution or showing care or attention.
They were careful when crossing the busy street.Meaning : Effortless and unstudied.
Example :
An impression of careless elegance.
Danced with careless grace.
Meaning : (usually followed by `of') without due thought or consideration.
Example :
Careless of the consequences.
Crushing the blooms with regardless tread.
Synonyms : regardless