uncheckedun‧checked /ˌʌnˈtʃekt◂/ adjective 
We cannot allow such behaviour to continue unchecked. This habit, if left unchecked, may cause serious problems later.
EXAMPLES FROM THE CORPUS
- And the sway of unchecked guns should not be underestimated.
- In contrast, a nonconstitutional regime is characterized by unchecked power, and the structural arrangements of the constitution are not upheld.
- Instead, it should be seen as a successful attempt to control speeds which would reach unacceptable levels if left unchecked.
- Once again, fires raged unchecked.
- Rachael had hidden a large kitchen knife in his jeans pocket and smuggled it in unchecked.
- The spring rains, unchecked by forest roots, reach flood proportions as they accumulate downstream.
- The tendencies are compliments to the power of statecraft and faith, marks of their potential for danger when unchecked.
- They can be unsightly if left unchecked, but must always be treated with care.
Longman Language Activatorto let something happen, without trying to stop it
to let someone do something, or let something happen, especially something bad that you should try to stop. Allow is more formal than let: let somebody/something do something: · You shouldn't let your husband treat you like that.· Don't let the dog get into the flowerbed.· It took all my willpower to remain cool and tell him not to let it happen again.allow something to do something: · The government has allowed the present economic crisis to get completely out of control.· The hedge should not be allowed to grow higher than six feet.
to let someone do something that they have chosen to do, although you could stop them, especially because they want to do it very much: · If you really want to become a lawyer, I'm not going to stand in your way.· Sally knew that modelling would be her career, and she was going to make sure that nothing stood in her way.
if something bad or unpleasant happens unchecked , it is allowed to continue to happen because no one is controlling it when they should be: · A fire broke out in the warehouse and raged unchecked for over two hours.· Over the last decade, the government has allowed the spread of poverty and unemployment to continue completely unchecked.
especially British, informal a law or official decision which seems to give someone the right to do something that most people think is morally wrong and should not be allowed: charter for somebody to do something: · This housing law would be a charter for dishonest landlords to cheat their tenants.thieves'/tax dodgers' etc charter: · The police decision to reduce their burglary squad has been described as 'a thieves' charter'.
COLLOCATIONS FROM THE ENTRY We cannot allow such behaviour to continue unchecked. This habit, if left unchecked, may cause serious problems later.COLLOCATIONS FROM OTHER ENTRIES
if something bad or harmful goes unchecked, it is not controlled or stopped and develops into something worsecontinue/grow/go unchecked We cannot allow such behaviour to continue unchecked. This habit, if left unchecked, may cause serious problems later. (=continue at the same high speed or level) The flood of refugees continued unabated.
The flood of refugees continued unabated. We cannot allow such behaviour to continue unchecked. This habit, if left unchecked, may cause serious problems later.