бдительный означает в английский

alert▼(attentive)
adjective
[UK: ə.ˈlɜːt] [US: ə.ˈlɝːt]

aware▼(vigilant, on one's guard)
adjective
[UK: ə.ˈweə(r)] [US: ə.ˈwer]

circumspect▼(carefully aware of all circumstances)
adjective
[UK: ˈsɜːk.əm.spekt] [US: ˈsɝːk.əm.ˌspekt]

vigilant▼(watchful)
adjective
[UK: ˈvɪ.dʒɪ.lənt] [US: ˈvɪ.dʒə.lənt]

watchful▼(observant, vigilant and aware)
adjective
[UK: ˈwɒtʃ.fəl] [US: ˈwɑːtʃ.fəl]