How to Say "annoying person" in Spanish
The Spanish word for “annoying person” is “pesada” — C1 level.
English → SpanishC1
NounC1informal
a female drag or bore

Examples
Esa vecina es una pesada, siempre se queja del ruido.
That neighbor is such a pain/drag, she always complains about the noise.
Llamó otra vez. ¡Qué pesada!
She called again. What an annoyance!
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