This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Taking insufficient care; negligent: a careless housekeeper; careless proofreading.

adj. Marked by or resulting from lack of forethought or thoroughness: a careless mistake.

adj. Showing a lack of consideration: a careless remark.

adj. Unconcerned or indifferent; heedless: careless of the consequences.

adj. Unstudied or effortless: danced with careless grace.

adj. Exhibiting a disposition that is free from cares; cheerful: a careless grin; a careless wave of the hand.

adj. Free from care or anxiety. hence, cheerful; light-hearted.

adj. Having no care; not taking ordinary or proper care; negligent; unconcerned; heedless; inattentive; unmindful; regardless.

adj. Without thought or purpose; without due care; without attention to rule or system; unstudied; inconsiderate; spontaneous; rash.

adj. Not receiving care; uncared for.

Free from care or anxiety; hence, undisturbed; cheerful.

Giving no care; heedless; negligent; unthinking; inattentive; regardless; unmindful.

Done or said without care; unconsidered: as, a careless act; a careless expression.

Not receiving care; uncared for.

Synonyms and Supine, Indolent, etc. (see listless); incautious, thoughtless, remiss, forgetful, inconsiderate.

adj. marked by lack of attention or consideration or forethought or thoroughness; not careful

adj. effortless and unstudied

adj. (usually followed by `of') without due thought or consideration

"Geithner apologized for what he called careless mistakes."

incautious    cursory    heedless    offhand    perfunctory    offhanded    slipshod    reckless    sloppy    slapdash   

incautious    forgetful    thoughtless    inattentive    negligent    unthinking    inconsiderate    supine    heedless    listless   

airless    hairless   

reckless    foolish    indifferent    lazy    gentle    bold    rude