This is the 13616th most frequent Swedish word.
varnat
Warned.
In this sentence, 'varnat' is the past participle of the verb 'varna', used to indicate that the act of warning someone has already taken place.
Jag har varnat dig om de farliga vägarna.
I have warned you about the dangerous roads.
Here, 'varnat' is used in the pluperfect tense to describe an action that was completed in the past before another past event.
De hade varnat oss för stormen.
They had warned us about the storm.
In this example, 'varnat' appears in a subjunctive mood to express a hypothetical situation where a warning might have been given.