Synonyms of the word

unguarded

• adj. Having no guard or protection; vulnerable.
• adj. Displaying a lack of caution or thought.

unwary

• adj. Lacking caution as a result of naïveté or inexperience.
• adj. Unprepared; not watchful.

vulnerable

• adj. More or most likely to be exposed to the chance of being attacked or harmed, either physically or emotionally.
• adj. (computing) More likely to be exposed to malicious programs or viruses.