Translation guide
The concept of 'uselessness' in Japanese is expressed through various words and phrases that convey lack of utility, futility, or worthlessness. The most common and versatile term is 役に立たない (yaku ni tatanai), literally 'does not stand to use.' Other expressions range from formal nouns like 無駄 (muda) for wastefulness to emotional terms like 無意味 (muimi) for meaninglessness. The choice depends on whether you're describing objects, actions, situations, or feelings of personal worthlessness.
Describing something that is not useful or helpful in a practical sense.
The most common and natural way to say something is useless. Literally 'does not stand to use.' Can describe objects, advice, skills, etc.
このアプリは全然役に立たない。
This app is completely useless.
That advice was useless.
A somewhat formal term meaning 'useless' or 'unnecessary.' Often used in written language or formal speech.
無用な物は捨ててください。
Please throw away useless items.
A noun meaning 'useless person/thing.' Often used critically or self-deprecatingly. Slightly stronger than 役に立たない.
彼は役立たずだ。
He's useless.
Expressing that an action or effort is pointless, in vain, or produces no result.
Means 'futile,' 'wasteful,' or 'useless.' Very common for actions that don't achieve anything. Often used in the phrase 無駄になる (come to nothing).
努力が無駄になった。
My efforts were useless (in vain).
時間の無駄だ。
It's a waste of time.
Literally 'there is no meaning.' Used when something is pointless or meaningless. Softer than 無駄.
そんなことをしても意味がない。
There's no point in doing that.
A noun/adjective meaning 'meaningless' or 'nonsensical.' More formal and abstract than 意味がない.
無意味な議論だ。
It's a useless discussion.
Describing something as having no value, merit, or being worthless.
Directly means 'worthless' or 'valueless.' Used for objects, ideas, or people in a more absolute sense.
その絵は無価値だ。
That painting is worthless.
A more conversational way to say 'has no value.'
この情報には価値がない。
This information is useless (has no value).
Means 'trivial,' 'silly,' or 'worthless.' Often used for things that are a waste of time or beneath consideration.
Expressing that a person feels or is considered useless, incapable, or incompetent.
As above, but specifically for people. Can be harsh or self-deprecating.
私は役立たずだ。
I'm useless.
Means 'incompetent' or 'incapable.' Stronger and more formal than 役立たず. Often used in workplace contexts.
A longer phrase meaning 'a person who is of no use.' Less direct than 役立たず.
自分が役に立たない人間に思える。
I feel like a useless person.
Describing something that cannot be used because it is broken, out of order, or not working.
Literally 'cannot use.' The most direct way to say something is unusable or broken.
このパソコンはもう使えない。
This computer is useless now (broken).
Means 'out of order' (for machines). Often seen on signs.
エレベーターは故障中です。
The elevator is out of order (useless).
無駄 (muda) emphasizes futility or waste, often of time/effort. 役に立たない (yaku ni tatanai) focuses on lack of practical utility. Use 無駄 for actions that are pointless, and 役に立たない for objects or information that don't help.
説明書が役に立たない。
The manual is useless (doesn't help).
説明書を読むのは無駄だ。
Reading the manual is a waste of time.
Direct translations like '無用性' (muyousei) are rarely used and sound unnatural. Stick to the common expressions listed above.
そんなこと、くだらないよ。
That's useless (silly/worthless).
He's a useless employee.