Word
seriously
Phoneticsse·ri·ous·ly, stress on the first syllable
US/ˈsɪɹiəsɫi/
UK/sˈiəɹɪəsli/
Adverb of manner
Definitions
01not joking
B1 · Intermediate
adv. in a way that is not joking or playful.
adv. in a literal, earnest, or solemn manner; without levity.
“I am seriously considering moving to another country for work.”
“The board is seriously evaluating the proposal, as the potential for long-term growth outweighs the immediate financial risks.”
Usage
usually follows the verb or sits at the end of the clause.
02very much or badly
B1 · Intermediate
adv. to a great or dangerous degree.
adv. to a severe or critical extent; used to intensify negative states or injuries.
“Several people were seriously injured in the car accident last night.”
“The local ecosystem was seriously affected by the chemical spill, requiring years of intensive restoration efforts.”
Usage
often modifies adjectives like 'injured', 'ill', or 'damaged'.
Synonyms
03changing to a serious topic
B2 · Upper Intermediate Informal
adv. you use this to stop joking and start talking about something important.
adv. used as a sentence adverb to signal a transition from a humorous or lighthearted tone to a sincere one.
“Seriously, we need to decide who is driving to the wedding.”
“Seriously though, if we don't address the budget deficit now, we won't have any funding for next year's projects.”
Usage
usually placed at the very beginning of a sentence.
Teaching tip
This is a 'discourse marker' that helps manage the flow of a conversation.
Synonyms
04showing disbelief
B1 · Intermediate Informal
adv. you say this when you are surprised or cannot believe what someone said.
adv. used as an exclamation or a question to express incredulity, annoyance, or emphasis.
“Seriously? You spent two hundred dollars on a pair of shoes?”
“Seriously? After all the help I gave him, he didn't even bother to send a thank-you note.”
Usage
often stands alone as a one-word question.
Teaching tip
In speech, the meaning changes based on intonation; a rising tone shows surprise, while a falling tone shows annoyance.
05extremely
B2 · Upper Intermediate Informal · Slang
adv. very or extremely; used to make an adjective stronger.
adv. used as a high-intensity degree adverb to modify adjectives.
“That new video game is seriously cool.”
“The view from the top of the mountain was seriously impressive, making the four-hour climb feel entirely worth the effort.”
Usage
placed immediately before the adjective it modifies.
Teaching tip
This is very common in youth slang and casual digital communication.
Synonyms
Collocations
Common phrases and expressions where native English speakers use the word “seriously” in context.
Verb
01. seriously affect
“The heavy rain could seriously affect the traffic this morning.”
adv + verb
02. seriously injured
03. seriously indeed
Etymology
From Middle English seriously, sereously, ceryously, seryowslech (“earnestly”), equivalent to serious + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
NOUN
ADJECTIVE
ADVERB
Idioms
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B1 PreliminaryIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.4.0–5.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 3.0–3.544–71TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.550–784
- Frequency
- Very common
- Level
- B1 · IntermediateOxford
- Updated
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englishreference.com/q/seriously