C1 adjective /ʌnˈɡɑː.dɪd/
Unguarded
незащищённый
Meaning
not protected or defended; careless about revealing private thoughts or information
Example
In an unguarded moment, she revealed her true feelings about the project.
В момент неосторожности она раскрыла свои истинные чувства по поводу проекта.