Translation guide
Expressing that someone is a worthless person in Japanese ranges from harsh insults to softer expressions of uselessness. The most common and direct term is 役立たず, but many options carry strong negative connotations and should be used with caution.
To describe someone who is incapable, unhelpful, or a burden, often in a practical sense.
Literally 'useless person'. A common and direct way to call someone worthless or good-for-nothing. Can be used seriously or jokingly among close friends.
彼は本当に役立たずだ。
He's really a worthless person.
役立たずの弟に手伝ってもらっても意味がない。
There's no point in getting help from my useless younger brother.
Means 'incompetent' or 'inept'. Often used in work or skill contexts to describe someone who lacks ability.
あんな無能な社員は初めて見た。
I've never seen such an incompetent employee.
A softer, more descriptive phrase meaning 'a person who is not useful'. Less harsh than 役立たず.
彼は役に立たない人だけど、性格はいい。
He's a useless person, but he has a good personality.
A stronger, more insulting combination meaning 'worthless good-for-nothing'. Very harsh.
Extremely insulting; avoid in polite conversation.
あの役立たずのろくでなしがまた失敗した。
That worthless good-for-nothing failed again.
To express that someone is morally worthless, contemptible, or the lowest of the low.
Literally 'trash' or 'scum'. A very common and strong insult for a worthless person. Used in casual, often angry contexts.
Very offensive; use only in extreme situations or fiction.
あんなクズは社会に必要ない。
Scum like that isn't needed in society.
Literally 'human trash'. Even stronger than クズ alone, emphasizing the person's lack of worth as a human being.
彼は人間のクズだ。
He's a worthless piece of scum.
Means 'dregs' or 'scum'. Similar to クズ but can be slightly less harsh depending on context. Often used in online slang.
お前はカスだ。
You're worthless scum.
To describe someone who is idle, irresponsible, or contributes nothing, often with a nuance of laziness.
A classic term for a good-for-nothing, ne'er-do-well. Implies the person is unreliable and worthless. Can be used half-jokingly.
うちの息子はろくでなしで、仕事もしない。
My son is a good-for-nothing; he doesn't even work.
Literally 'grain-waster', meaning a person who is a burden on others, especially financially. Strongly negative.
Means 'lazy person'. Not as strong as 'worthless', but can imply worthlessness due to laziness.
To label someone as a failure in life, a loser, or someone who can't succeed.
Literally 'loser dog'. A common term for a loser or underdog, often used in the context of life competition.
彼は人生の負け犬だ。
He's a loser in life.
Means 'no-good person' or 'failure of a human being'. Casual and self-deprecating or insulting.
Literally 'dropout' or 'left-behind'. Refers to someone who has fallen behind or failed to keep up, often in education or career.
Many Japanese words for 'worthless person' are strong insults. 役立たず is relatively mild and can be used jokingly, but クズ, 人間のクズ, and 穀潰し are extremely offensive. Use with extreme caution, and avoid in formal or polite settings.
上司に「役立たず」と言うのは失礼です。
It's rude to call your boss 'useless'.
役立たず focuses on being unhelpful or a burden, while 無能 emphasizes lack of skill or competence. 役立たず is more emotional and common in daily speech; 無能 is more objective and often used in professional evaluations.
彼は役立たずだが、無能ではない。
He's useless, but not incompetent.
彼は親のすねをかじる穀潰しだ。
He's a worthless freeloader living off his parents.
あの怠け者は何の役にも立たない。
That lazy person is completely useless.
俺はダメ人間だ。
I'm a worthless failure.
彼は社会の落ちこぼれだ。
He's a dropout from society.