Spanish phrase
Lo dudo.
Meaning
I doubt it.
When to use it
Expresses personal skepticism about a claim. Used to softly disagree or question what someone said, often polite but can come off as negative.
Example dialogue
¿Dijo que aprobó el examen?
Did he say he passed the exam?
Lo dudo, no suele estudiar para los exámenes.
I doubt it, he doesn't usually study for exams.