1. Lack of confidence in oneself; uncertainty about one's abilities, qualities, or decisions
She struggled with self-doubt throughout her career.
Ela lutou contra a dúvida em si mesma durante toda sua carreira.
2. The state of distrusting one's own judgment or competence
His self-doubt prevented him from applying for the promotion.
Sua dúvida em si mesmo o impediu de se candidatar à promoção.