Self-doubt is a common feeling that occurs when someone lacks confidence in their abilities or decisions. However, there are different synonyms for self-doubt that can help describe this feeling. One of these synonyms is insecurity, which refers to the lack of certainty or confidence in one's abilities or worth. Another synonym is hesitation, which indicates a reluctance or uncertainty about making a decision or taking action. Self-doubt can also be described as apprehension, which is a feeling of anxiety or unease about a particular situation. Lastly, misgiving is another synonym for self-doubt that refers to a feeling of doubt or suspicion about something.