›not guarded or protected: You shouldn't leave your bag unguarded in a pub like that.Unsafe and insecure›If you make an unguarded remark or say something in an unguarded moment, you tell someone something that you would usually keep secret, sometimes in a way that shows bad judgment: In an unguarded moment, I said that I didn't trust Carlo.Not paying attentionTreating as unimportantNeglecting and ignoring