serious

Compared meaning: a serious, not playful attitude or manner (adjective).

比较义项：严肃、不苟言笑的态度或举止（形容词）。

• serious 本词

  The plain, general word for a serious look, tone, or mood; neutral and common in everyday speech, without implying the sincerity, restraint, or formality the others carry.

  这是表示“严肃”最普通、中性的说法，用于描述神情、语气或心情，日常口语常用，不像其他几个词那样强调真诚、稳重或正式。

  He looked serious when he read the letter.

  他读信的时候看起来很严肃。

• earnest

  Stresses sincere, heartfelt effort or intention behind words or actions; often collocates with 'attempt', 'promise', or 'plea', showing the speaker really means it.

  强调言行背后真诚、发自内心的努力或意图，常与“attempt（尝试）”“promise（承诺）”“plea（恳求）”等词搭配，表示说话人是认真、诚心的。

  He made an earnest attempt to apologize for his mistake.

  他真诚地尝试为自己的错误道歉。

• sober

  Describes sensible, level-headed, self-controlled behavior or judgment, often contrasted with recklessness or excess; suggests calm rationality rather than sincerity or formality.

  形容稳重、理智、自我克制的行为或判断，常与鲁莽或放纵形成对比，强调冷静理性，而不是真诚或正式。

  Even in a crisis, she gives sober, level-headed advice to her team.

  即使在危机中，她也能给团队提出稳重、理智的建议。

• solemn

  Emphasizes formality and gravity, describing dignified, humorless occasions, ceremonies, or promises; more about a grave atmosphere than a personal trait.

  强调正式和庄重，用于描述肃穆、不苟言笑的场合、仪式或誓言，侧重庄重的气氛，而不是个人的性格特点。

  The soldiers made a solemn promise to protect their country.

  士兵们庄重地承诺要保卫自己的国家。

All four describe a serious manner, but differ. Serious is the plain, neutral word. Earnest stresses sincere, heartfelt intention, as in an earnest promise. Sober stresses calm, level-headed judgment. Solemn stresses formality, for ceremonies. Serious's 'severe' sense and sober's 'not drunk' sense aren't compared.

这几个词都可以形容人认真严肃、不轻浮的态度或举止，但侧重点和语气不同：earnest 强调真诚用心，sober 强调稳重理智，solemn 强调正式庄重，serious 则是最普通中性的说法。这里不比较 serious 表示“严重的”（如 a serious illness）以及 sober 表示“未喝醉的”（如 stay sober）等其他义项。

Compared meaning: important (adjective).

比较义项：重要的（形容词）。

• serious 本词

  Serious describes something important because it is severe or worrying and demands careful attention, often used for problems or illness, usually with a negative tone.

  serious 表示某事物因严重或令人担忧而重要，常需要认真对待，多用于问题或疾病等场合，往往带有消极色彩。

  The doctor said her condition was serious and needed immediate treatment.

  医生说她的病情很严重，需要立即治疗。

• primary

  Primary marks something as the main or most important one among several, often used for goals, reasons, or focuses, without any negative or positive tone.

  primary 表示在若干事物中最主要、最重要的那一个，常用于目标、原因或重点，不带褒贬色彩。

  Reducing costs is the primary focus of the new strategy this year.

  降低成本是今年新战略的主要重点。

• great

  Great emphasizes that something is important because of its scale, excellence, or lasting impact, often used to praise people, achievements, or historical events.

  great 强调某事物因规模宏大、成就卓越或影响深远而重要，常用于赞美人物、成就或历史事件。

  Inventing the printing press was one of the great achievements in human history.

  发明印刷术是人类历史上的伟大成就之一。

• big

  Big is an informal, everyday way to call something important, often for personal or casual matters, and sounds too casual for formal or historic contexts.

  big 是口语化、日常的说法，用来表示某事重要，多用于个人或非正式场合，若用于正式或历史性语境会显得过于随便。

  Choosing a college major is a really big decision for a teenager.

  选择大学专业对一个十几岁的孩子来说是一个非常重大的决定。

Serious, primary, great and big can all mean important, but tone differs. Serious means important because it is severe or worrying. Primary means the main one among several. Great means important due to scale or excellence, praising people or achievements. Big is informal, used casually.

这些词在表示“重要的”时意思相近，但语气和搭配不同：serious 强调事情严重、需要认真对待；primary 强调主要、优先；great 强调意义重大、常形容人物或成就；big 语气口语化，随意地表示“重大”。这里不比较 primary 的“最初级的”（如 primary school）、great 的“极好的，令人愉快的”（如 have a great time）以及 big 的“体积大的”等其他义项。

Compared meaning: very serious or dangerous (adjective).

比较义项：严重的、危险的（程度深、情况危急）（形容词）。

• critical

  Used mainly for a point where someone's life is in immediate danger, especially in medicine ('critical condition'); also suggests a decisive turning point. More clinical and urgent than serious.

  主要用于形容生命垂危、情况危急的时刻，尤其用在医学语境中（如“病危”）；也可表示决定性的关键时刻。语气比 serious 更专业、更紧迫。

  After the crash, the driver was rushed to hospital in critical condition.

  车祸后，司机被紧急送往医院，伤势危重。

• serious 本词

  The mildest, most general term here, covering injuries, illnesses or problems that are bad but not necessarily life-threatening. Fits many everyday situations where the other three would sound too strong.

  四个词中语气最温和、最笼统，可泛指伤情、疾病或问题“严重”，但不一定危及生命。适用于许多日常场合，换成其他三个词会显得语气过重。

  He suffered a serious knee injury that kept him out of sport for months.

  他膝盖严重受伤，好几个月都不能参加运动。

• dire

  The strongest word here, stressing extreme severity and urgency and often warning of a bad outcome to come. Typically fixed with 'need', 'consequences' or 'straits'; sounds dramatic or literary.

  四个词中语气最强，强调程度极其严重、情况紧迫，常带有警示即将发生坏结果的意味。常与“需要”（need）、“后果”（consequences）、“困境”（straits）等词固定搭配，语体偏夸张、文学化。

  After the earthquake, survivors were in dire need of food, water and shelter.

  地震过后，幸存者们极度需要食物、水和住所。

• severe

  Focuses on the intensity of something bad, such as pain, weather, damage or punishment, without necessarily implying danger to life. Common with weather, injuries and penalties.

  侧重形容坏事的强度或程度，例如疼痛、天气、损失或惩罚，但不一定意味着生命垂危。常与天气、伤情和处罚等词搭配使用。

  The storm caused severe damage to the old bridge, closing it for repairs.

  那场暴风雨给那座老桥造成了严重损坏，桥梁因此关闭维修。

Critical, serious, dire and severe all describe something dangerous, but strength differs. Critical means life is in immediate danger. Serious is mildest, covering bad but not life-threatening problems. Dire is strongest, warning of extreme danger. Severe stresses intensity, like pain or weather, without implying danger.

这四个词都可用来形容伤情、天气或局势的严重、危险程度，但紧迫感和语气强弱不同：dire 语气最强，serious 语气最温和；这里不比较 critical 表示“批评的”这一义项，也不比较 serious 表示人的神情或态度“严肃认真”的这一义项。