If you're not sure if someone is lacking confidence, there are a few key signs to look for. For example, if someone is constantly seeking reassurance from others or making self-deprecating comments, it's likely that they don't have much faith in themselves. Additionally, people who lack confidence often avoid taking risks or speaking up, instead opting to stay in their comfort zone.
Of course, it's important to keep in mind that everyone has moments of insecurity and self-doubt - so simply exhibiting one or two of these behaviors doesn't mean that someone definitely lacks confidence. However, if you notice that someone consistently seems to lack self-assurance, it might be worth talking to them about it (if they're comfortable discussing the topic). Ultimately, helping them build up their confidence could make a big difference in their life!