How to Say "tiresome" in Spanish
The Spanish word for “tiresome” is “pesado” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
adjectiveA2informal
someone who is boring or repetitive

Examples
¡Qué pesado eres! Deja de preguntarme lo mismo.
You're so annoying! Stop asking me the same thing.
Mi jefe estuvo muy pesado en la reunión de hoy.
My boss was being a real pain in today's meeting.
No quiero ser pesado, pero necesito ese informe.
I don't want to be a nuisance, but I need that report.
Ser vs. Estar
Use 'ser pesado' if someone is an annoying person by nature. Use 'estar pesado' if they are just being annoying in this specific moment.
Too literal
Mistake: “Él es muy 'annoying'.”
Correction: Él es muy pesado.
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