Any serious synonym you choose must fit one of several unlike meanings: a severe storm, a grave mistake, a sincere apology, a solemn face or a critical condition. Get the sense wrong and you can turn "she is serious about the job" into "she is grim about the job."
Each meaning below gets another word for serious that fits it, then you will see a strength scale, swaps in context and opposites that range from minor to playful. Similar adjectives for tone and mood live among the describing words.
Swatch at a glance
Best swaps
severe, grave, sincere, solemn, criticalPart of speech
AdjectiveMost formal
grave, consequential, earnestMost casual
no joke, for real, heavyStrongest
critical, dire, life-threateningAntonyms
minor, trivial, lightheartedWatch out
Grave sounds very formal and heavy. Do not use it for a small error.Adverb
seriously: severely, gravely, sincerely
Which meaning of serious do you need
| Meaning | Swap with | Example |
|---|---|---|
| Bad or dangerous | severe, grave, critical | The flood caused severe damage. |
| Not joking | sincere, earnest, genuine | He made a sincere offer to help. |
| Solemn look or mood | solemn, stern, somber | The judge wore a stern expression. |
| Needs attention | important, weighty, pressing | Climate is a pressing topic. |
| Dedicated to a goal | committed, determined | She is committed to running a marathon. |
The first and second rows cause the most mix-ups, so check which one your sentence means.
Serious synonym strength, from notable to critical
For problems and injuries, the chips climb in weight. Notable means worth mentioning. Significant means it has a clear effect. Major marks a large problem, about where serious itself sits. Severe means it causes real harm or pain. Critical means things are at a turning point, as in critical condition in a hospital.
Grave and dire are near the top too, but they carry a formal, worried tone. A news report might say grave concern; a friend would say really worried.
Same sentence, better word
- A serious injury becomes a severe injury.
- A serious mistake by the bank becomes a grave error by the bank.
- Are you serious becomes do you really mean that in writing, or for real in a text.
- He had a serious look on his face becomes he had a solemn look on his face.
- We need a serious talk becomes we need an honest talk.
- She is serious about music becomes she is dedicated to music.
A manager writes: "This is a serious issue and we are serious about fixing it." Rewritten: "This is a significant issue, and we are committed to fixing it this week." The two meanings now have two different words.
Tone and context
Medical and safety writing favors precise strength words: severe, acute, life-threatening. Legal and news writing likes grave and significant. Personal letters use sincere and earnest for intentions. In casual speech, people say no joke, heavy or a big deal.
Somber and solemn fit funerals and memorials. Stern fits a teacher or parent. Grim adds a sense that things look bad.
Seriously, and serious about
The adverb follows the same split. Seriously hurt becomes badly hurt or severely hurt. Take it seriously becomes treat it as important or give it proper attention. In speech, "Seriously?" works like "Really?" and needs no formal swap.
Serious about plus a goal is about commitment. Use committed to, determined to or set on: she is set on becoming a pilot. For that sense, the determined synonyms page goes further.
Light, small and playful: the opposites
For problems, the opposite is minor or trivial. For mood, it is lighthearted, playful or joking. Frivolous criticizes something as silly when it should be serious.
- Luckily, it was only a minor cut.
- The speech had a lighthearted ending.
Frequently asked questions
Which word means a serious problem, but stronger?
Severe, critical and dire are stronger. Critical suggests the situation could turn very bad very soon.
How do I say serious in a formal report?
Significant, grave and substantial suit formal writing. Use grave only for matters with heavy consequences.
Can sincere replace serious?
Yes, when serious means not joking: a sincere apology, a sincere question. It does not fit injuries or problems.
What do you call a serious person?
Earnest, solemn and sober describe the personality. Stern and dour add strictness or gloom, so they are less kind.
Is grave more serious than serious?
Yes, it is heavier and more formal. Grave concern or a grave error suggests possible harm or loss.
How do I say not serious in one word?
Minor or trivial for problems, and lighthearted or playful for mood. Joking fits a remark that was not meant to be taken at face value.