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.
He's really a worthless person.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
He's useless, but not incompetent.
You're worthless scum.
He's a worthless freeloader living off his parents.
That lazy person is completely useless.
I'm a worthless failure.
He's a dropout from society.