What a pain! / How annoying! / So tedious!
Expresses frustration at someone or something that is boring, irritating, or won't leave you alone. Pesado literally means heavy but colloquially means a bore or pest.
—He's been talking about the same thing for an hour. —What a pain!
How annoying this rain is, it won't stop!
—He's asking me the same thing again. —How annoying he is!