非常識

• Reading: ひじょうしき
• Romaji: hijōshiki
• Kanji breakdown: 非 (non-/un-) + 常識 (common sense) → lacking common sense
• Pronunciation: /hi.dʑoː.ɕi.ki/

Meaning

Lacking common sense, socially unacceptable behaviour — one of the harshest everyday criticisms in Japanese.

The opposite of 常識, being called 非常識 is a serious social indictment in Japan. It means you have violated the unwritten social codes that everyone is expected to follow. Unlike a simple mistake, 非常識 implies a fundamental failure to understand how society works. It is used for everything from minor social faux pas to genuinely outrageous behaviour, and is one of the most cutting everyday insults.

Examples

1. 電車の中で大声で電話するなんて非常識すぎる。 Talking loudly on your phone on the train is just beyond unacceptable.
2. 非常識な人って自覚がないからタチが悪い。 People with no common sense are the worst because they have zero self-awareness.
3. 深夜に掃除機かけるとか非常識にもほどがある。 Running a vacuum cleaner in the middle of the night — that's outrageously inconsiderate.

Usage Guide

Context: everyday conversation, neighbourhood disputes, social media

Tone: judgmental, indignant

Do Say

• あの行動は非常識だと思わない？ (Don't you think that behaviour is beyond the pale?)
• 非常識な客が増えてサービス業は大変だ (With more rude customers, the service industry has it rough)

Don't Say

• 文化の違いを「非常識」と決めつけない (Don't label cultural differences as 'lacking common sense')

Common Mistakes

• Underestimating how harsh 非常識 sounds — it is a stronger criticism than the English 'rude' or 'inconsiderate'
• Applying Japanese 常識 standards to people from different cultures and calling them 非常識

Origin & History

Direct negation of 常識 (common sense) using the prefix 非 (non-). As 常識 became a powerful social enforcement tool, 非常識 became one of the strongest everyday criticisms of social behaviour.

Cultural Context

Era: Timeless, reflects Japan's strong social code system

Generation: All ages

Social background: Universal

Regional notes: Used across all of Japan. A cornerstone of Japanese social criticism and one of the most common complaints.