unguarded
adj. B2 Upper Intermediate US //ənˈɡɑɹdɪd// UK //ʌnɡˈɑːdɪd// un·guard·ed
adj. not protected or watched over. It can also describe someone who is not careful with their words or actions, often saying things they do not mean to say.
adj. lacking protection, defense, or surveillance; also describes a lack of caution or restraint in speech or behavior. Often used to describe a moment of vulnerability or a slip of the tongue.
The house was left unguarded while the family was on vacation.
The politician made an unguarded comment about his opponent during a private dinner, which later appeared in the morning papers.
The fortress was left unguarded for several hours while the garrison marched to the neighboring village, a lapse in security that the enemy quickly exploited to gain entry.