1A coarse or rough way to refer to a man or fellow; can be used casually among friends but has a rough tone.
あの野郎、仕事はできるけど態度がでかい。
That guy is good at his job, but his attitude is arrogant.
新しいアルバイトの野郎は挨拶をちゃんとする。
The new part‑timer guy greets people properly.
こんな野郎に負けるものか。
I won't lose to a guy like this.
2A derogatory, insulting term used to curse someone (roughly equivalent to 'bastard' or 'asshole').
この野郎！ふざけんなよ。
You bastard! Don't mess with me.
あの野郎のせいで電車に遅れた。
Because of that asshole, I was late for the train.
いい加減にしろ、この野郎！
Cut it out, you bastard!