un ‧ guard ‧ ed /ʌnˈɡɑːdəd, ʌnˈɡɑːdɪd $ -ɑːr-/ BrE AmE adjective
1 . an unguarded moment a time when you are not paying attention to what you are doing or saying:
In an unguarded moment, he admitted that he wanted to quit his job.
2 . an unguarded remark, statement etc is one that you make carelessly without thinking of the possible effects
3 . not guarded or protected by anyone