How to Say "self-doubt" in Spanish
The Spanish word for “self-doubt” is “inseguridad” — B1 level. This is a very common word in everyday Spanish.

Examples
Tengo mucha inseguridad cuando hablo español en público.
I feel a lot of insecurity when I speak Spanish in public.
La inseguridad emocional es común durante la adolescencia.
Emotional insecurity is common during adolescence.
Para superar tu inseguridad, debes confiar más en tus habilidades.
To overcome your self-doubt, you must trust your skills more.
Always Feminine
Naming words (nouns) that end in '-dad' are almost always feminine. You should always use 'la' or 'una' with this word.
No plural usually needed
When talking about feelings of self-doubt, we usually use the singular 'inseguridad' even if we have many different worries.
Gender Error
Mistake: “El inseguridad es mala.”
Correction: La inseguridad es mala. Because it ends in -dad, it must be feminine.
Related Translations
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