Translation guide
A vulgar insult for a contemptible or stupid person. Japanese has many rough insults, but direct translations are rare; the best choice depends on context, gender, and intensity.
shithead (general insult)
Vulgar, strong; literally 'shit bastard'. Used mostly by men.
Express strong contempt for someone, similar to 'shithead' as a general insult.
Vulgar and strong; literally 'shit bastard'. Commonly used by men. Conveys anger and disrespect.
That shithead is late again.
Very common insult meaning 'idiot' or 'bastard'. Less vulgar than クソ野郎 but still strong.
You shithead!
Literally 'dregs' or 'scum'. Used as a dismissive insult for a worthless person. Slangy and contemptuous.
Disappear, you shithead.
Call someone a shithead emphasizing their stupidity.
Kansai dialect for 'idiot', but widely understood. Can be used jokingly or offensively. Less vulgar than クソ野郎.
You don't even understand something that simple, you shithead.
Standard word for 'fool' or 'idiot'. Can range from mild to strong depending on tone.
Express that someone is a shithead because they are irritating or hateful.
Literally 'irritating guy'. A common way to call someone a shithead without using a specific insult word. 奴 (やつ) is casual/rude for 'person'.
That shithead came again.
Slang for 'annoying person'. ウザい is a shortened form of うざったい (annoying). Very common among young people.
What a shithead, seriously.
There is no direct Japanese equivalent of 'shithead' that matches its nuance exactly. Using クソ頭 (くそあたま) would be nonsensical. Choose an insult based on the specific meaning you want to convey.
shithead (literal, unnatural)
Most of these insults are rough and masculine. Women may use them but risk sounding very coarse. In polite company, avoid these entirely and use milder expressions like 困った人 (こまったひと, 'troublesome person').
That person is really a problem (polite).
Are you a shithead or what?