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.
adj showing lack of care for consequences
carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy
characterized by inability or unwillingness to work toward a goal or assume responsibility
not fit to assume responsibility
lacking a sense of restraint or responsibility
irresponsible in the use of firearms
free from control or responsibility
lacking a sense of responsibility
worthy of or requiring responsibility or trust; or held accountable
caused by law or conscience to follow a certain course
careful and sensible; marked by sound judgment
liable to account for one's actions
morally or legally responsible to a higher authority
liable to answer to a higher authority
held legally responsible
taking responsibility for one's conduct and obligations
worthy of trust or belief
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