unsupervised       
adjective uk/ʌnˈsuː.pə.vaɪzd/ us/ʌnˈsuː.pɚ.vaɪzd/
 无人监督(或指导)的
without anyone watching to make sure that nothing dangerous or wrong is done or happening
  Young children should not be left alone with animals unsupervised.  年幼的孩子不应该在没人看管的情况下单独和动物在一起。 
 - More examples
 - In the UK the law states that parents can be prosecuted for wilful neglect if they leave a child unsupervised 'in a manner likely to cause unnecessary suffering or injury to health'.
 - Many of these jobs were performed by unsupervised nonphysicians at spas.
 - The lake is an attraction in hot weather, but bathing unsupervised can lead to problems.
 - Never leave the grill unsupervised when in operation.