careless

careless
care‧less /ˈkeələs $ ˈker-/ adjective1. not paying enough attention to what you are doing, so that you make mistakes, damage things etc
   OPP  careful:
    It was careless of him to leave the door unlocked.
    a careless mistake
    careless driving
    careless with
    He’s careless with his glasses and has lost three pairs.
    Careless talk can be disastrous for a business.
2. [usually before noun] natural and not done with any deliberate effort or attention:
    He ran a hand through his hair with a careless gesture.
3. not concerned about something
    careless of
    a man careless of his own safety
    She gave a careless shrug.
HINT: ► Do not use ‘careless’ to mean that someone has no worries. Use carefree: They all felt happy and carefree.
—carelessly adverb
—carelessness noun [uncountable]
     

THESAURUS

   ▪ careless not paying enough attention to what you are doing, so that you make mistakes, damage things etc: I made a few careless mistakes. | It was careless of you to leave your purse lying about. | He started getting careless about taking his medication.
   ▪ clumsy often dropping or breaking things because you move around in a careless way: I’m so clumsy, I spilt milk all over the floor. | a clumsy child
   ▪ sloppy careless and lazy in the way you do your work or in your behaviour generally: As a student, he was brilliant but sloppy. | I will not tolerate sloppy work.
   ▪ reckless especially written doing dangerous or stupid things without thinking about your own or other people’s safety: The driver of the car was arrested for reckless driving. | His actions showed a reckless disregard for human life.
   ▪ irresponsible careless in a way that might affect other people, especially when you should be taking care of them: It’s irresponsible for parents to let their children smoke. | his irresponsible attitude to keeping animals
   ▪ tactless carelessly saying something that upsets or embarrasses someone, without intending to do this: He kept making tactless remarks about her appearance. | a tactless question | I thought it would be tactless to ask about her divorce.
   ▪ casual not being careful enough about something and treating it as though it is not important: He seems to have a very casual attitude towards his work. | She disliked the casual way in which he made decisions affecting other people’s lives.
   ▪ negligent careless about something that you are responsible for, so that serious mistakes are made – used especially when someone will be officially punished for this: The doctor was negligent in using the wrong type of needle. | They found him guilty of negligent conduct.