Translation guide
The quality of being not guided by or based on good sense; the state of being excessive, unfair, or irrational. This concept is expressed in Japanese through various nouns, adjectives, and set phrases depending on the nuance.
Describing something that is irrational, illogical, or not based on sound reasoning.
A formal noun/adjective meaning 'irrationality' or 'unreasonableness'. Often used in logical, academic, or business contexts.
That proposal is unreasonable.
Emphasizes unfairness and lack of reason, often with emotional weight. Commonly used for situations that feel unjust or absurd.
I can't comply with unreasonable demands.
A phrase meaning 'it doesn't make sense' or 'it's illogical'. Used when an argument or action lacks coherence.
His explanation is unreasonable.
Describing something that goes beyond acceptable limits, often in demands, prices, or behavior.
A very common word meaning 'impossible', 'unreasonable', or 'excessive'. Used for requests, expectations, or situations that are too much to handle.
That's an unreasonable order.
Means 'exorbitant' or 'outrageous', especially for prices or demands. Stronger than 無理 in terms of excess.
A formal term for 'excessive' or 'undue'. Often used in written or technical contexts.
Describing a situation or treatment that is not fair or equitable.
Describing a person who refuses to listen to reason or is willfully irrational.
Means 'tyrannical' or 'high-handed'. Used for someone who acts unreasonably and oppressively, often in a position of power.
I can't stand my boss's unreasonable attitude.
Literally 'can't get through to them'. Describes someone who won't listen to reason.
He is unreasonable.
不合理 is more objective and logical, while 理不尽 carries a stronger emotional charge of unfairness and absurdity. Use 不合理 for factual unreasonableness and 理不尽 when expressing frustration.
The English word 'unreasonable' covers many nuances. Direct translation as '非合理的' is rarely used. Choose the Japanese term that matches the specific context: logic, excess, unfairness, or stubbornness.
法外な値段を請求された。
I was charged an unreasonable price.
Please refrain from unreasonable demands.
That rule is unreasonable.