irresponsible

If you're irresponsible, you're careless about the consequences of your actions. You can't really rely on irresponsible people.

Being irresponsible is the opposite of being responsible and careful — you do what you like and don't care what happens afterward. Forgetting to feed your dog for a week is irresponsible. Splashing around in a mud puddle in your new white pants is irresponsible. Drug use and unsafe sex are irresponsible. When the government runs up a huge deficit, many people think that's irresponsible. If you have to work with someone irresponsible, good luck: you're going to need it.

Definitions of irresponsible
  1. adjective
    showing lack of care for consequences
    “behaved like an irresponsible idiot”
    “hasty and irresponsible action”
    Synonyms:
    carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy
    cheerfully irresponsible
    do-nothing
    characterized by inability or unwillingness to work toward a goal or assume responsibility
    feckless
    not fit to assume responsibility
    idle, loose
    lacking a sense of restraint or responsibility
    trigger-happy
    irresponsible in the use of firearms
    unaccountable
    free from control or responsibility
    unreliable
    lacking a sense of responsibility
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    Antonyms:
    responsible
    worthy of or requiring responsibility or trust; or held accountable
    obligated
    caused by law or conscience to follow a certain course
    prudent
    careful and sensible; marked by sound judgment
    accountable
    liable to account for one's actions
    answerable
    morally or legally responsible to a higher authority
    amenable
    liable to answer to a higher authority
    liable
    held legally responsible
    trustworthy
    taking responsibility for one's conduct and obligations
    trustworthy, trusty
    worthy of trust or belief
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