How to Say "talking nonsense" in Spanish
The Spanish word for “talking nonsense” is “disparando” — C1 level.
English → SpanishC1
Verb (Gerund)C1informal
speaking wildly or without sense

Examples
Estuvo toda la noche disparando sobre teorías de conspiración.
He was talking nonsense all night about conspiracy theories.
Cuando bebe demasiado, termina disparando sin parar.
When he drinks too much, he ends up spouting crazy things non-stop.
Figurative Extension
This meaning is figurative, imagining words being 'shot out' without control or sense. It’s usually used in the continuous form ('estar disparando').
Related Translations
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