This is the 12212th most frequent Spanish word.
irritante
Causing annoyance or discomfort.
Here, 'irritante' serves as an adjective describing the effect of loud music, expressing annoyance.
Esa música alta es muy irritante.
That loud music is very irritating.
In this usage, 'irritante' describes a specific action that causes irritation or annoyance.
Es irritante cuando no devuelven tus llamadas.
It's irritating when they don't return your calls.
'Irritante' in this sentence qualifies 'content', emphasizing that the nature of the email message is troublesome or annoying.