In-secureness is a state of being uncertain, fearful, or doubtful about oneself or a situation. The antonyms for the word include confidence, assurance, certainty, security, and self-assurance. Confidence refers to having faith and trust in oneself or others. Assurance implies a sense of certainty and trustworthiness in a situation. Certainty suggests a lack of doubt, ambiguity, or hesitation. Security is a state of being free from danger, harm, or threat. Self-assurance suggests confidence and belief in oneself and one's abilities. Using these antonyms, we can focus on ways to cultivate positivity and reduce in-secureness in our lives.