What does it mean to be described as "fearless"?

Being described as "fearless" indicates a state of lacking fear, which means that the individual approaches situations, challenges, or threats without experiencing the typical response of fear. This trait may suggest courage and the ability to confront daunting circumstances or risks without being deterred by anxiety or trepidation.

In contrast, the other choices depict different attitudes or behaviors. Caution entails being careful and apprehensive, which is the opposite of being fearless. Being overly concerned suggests a heightened level of anxiety, again contrary to the fearless disposition. Lastly, acting without thinking can imply recklessness or a lack of caution, which does not equate to the meaningful bravery associated with being truly fearless; such behavior may indeed expose someone to unnecessary dangers without proper assessment. Therefore, the essence of being fearless lies in the absence of fear rather than the presence of recklessness or caution.