The antonyms for the phrase "feels confident" can range from a lack of self-assurance to a deep-seated sense of insecurity. Words like hesitant, unsure, nervous, timid, and anxious all describe the opposite of confidence. When someone doesn't feel confident, they may also exhibit symptoms of fear, doubt, or discomfort. They may experience a pang of insecurity or feel apprehensive about their actions and capabilities. Moreover, when facing a challenge, they may feel like giving up or cower under pressure. It is vital to keep in mind that everyone has moments when they lack confidence, but what sets successful individuals apart is their ability to overcome these challenging emotions and persevere.