This is the 4423rd most frequent Russian word.
виноват
"Vиноват" means "guilty" or "at fault."
In this sentence, 'виноват' refers to the speaker admitting their guilt or responsibility for an action or situation.
Я виноват за опоздание на работу.
I am responsible for being late to work.
Here, 'виноват' expresses the idea of being at fault or blamed for something.
Он всегда думает, что во всем виноват.
He always thinks that he is to blame for everything.
In this example, 'виноват' is used in its negated form, denying responsibility for an event.