The word "over-confident" means having an excessive amount of faith in oneself or one's abilities. Antonyms for "over-confident" would include terms such as humble, self-doubting, modest, diffident, uncertain, and reserved. These words imply a lack of ego and a tendency to undervalue one's own worth and capabilities. While being over-confident can lead to arrogance and recklessness, embracing humility and modesty can help individuals cultivate a more balanced and realistic perspective of their abilities. Therefore, it is crucial to avoid falling into the trap of over-confidence and strive for humility to succeed in personal and professional aspects of life.