Formal and informal vocabulary are used in different situations in English. Formal words are more common in professional, academic, and official communication, while informal words are commonly used in everyday conversations with friends, family, and people we know well.
Understanding the difference between formal and informal vocabulary can help you choose the right words for emails, conversations, essays, meetings, and other situations.
Table of Contents
What Is Formal Vocabulary?
Formal vocabulary consists of words and expressions commonly used in professional, academic, business, and official situations.
For example:
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purchase instead of buy
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assist instead of help
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inform instead of tell
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require instead of need
Formal vocabulary generally sounds more professional and less conversational.
What Is Informal Vocabulary?
Informal vocabulary consists of words and expressions commonly used in everyday conversations and casual communication.
For example:
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buy instead of purchase
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help instead of assist
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tell instead of inform
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need instead of require
Informal English is especially common when speaking with friends, relatives, classmates, and people you know well.
Formal vs Informal Vocabulary
| Informal | Formal | Example |
|---|---|---|
| ask | inquire | I would like to inquire about the position. |
| buy | purchase | You can purchase tickets online. |
| help | assist | Could you assist me with this issue? |
| tell | inform | Please inform us of any changes. |
| need | require | This position requires experience. |
| get | obtain | You must obtain permission first. |
| give | provide | Please provide additional information. |
| show | demonstrate | The results demonstrate significant improvement. |
| check | verify | Please verify your email address. |
| find out | discover | Researchers discovered a new method. |
100+ Formal and Informal Words
[Add the complete vocabulary table here, organized into useful groups.]
Formal vs Informal Verbs
Include common pairs such as:
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ask → inquire
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buy → purchase
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get → obtain
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help → assist
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tell → inform
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show → demonstrate
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fix → repair
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put off → postpone
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find out → discover
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look into → investigate
Formal vs Informal Adjectives
Compare everyday adjectives with more formal alternatives.
Examples:
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good → beneficial
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bad → unfavorable
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enough → sufficient
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wrong → incorrect
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cheap → inexpensive
Formal vs Informal Phrases
Compare complete expressions rather than individual words.
For example:
Informal: Thanks for your help.
Formal: Thank you for your assistance.
Informal: Sorry I’m late.
Formal: I apologize for the delay.
Informal: Can you send me the report?
Formal: Could you please send me the report?
Formal vs Informal Vocabulary in Emails
Explain how vocabulary changes between casual and professional emails.
| Informal | More Formal |
|---|---|
| Hi | Dear Mr./Ms. |
| Thanks | Thank you |
| Sorry | I apologize |
| Can you…? | Could you please…? |
| I need… | I would require… |
| Let me know | Please inform me |
| See you soon | I look forward to seeing you |
Formal vs Informal Vocabulary in Writing
Formal vocabulary is generally preferred in:
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academic essays
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reports
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research papers
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business documents
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official letters
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professional emails
Informal vocabulary is more appropriate for:
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personal messages
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social media
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casual emails
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conversations
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texts to friends and family
Formal vs Informal Vocabulary in Speaking
The vocabulary you choose also depends on who you are speaking to.
You might say:
To a friend: “Can you help me with this?”
But in a professional situation:
To a colleague or client: “Could you assist me with this?”
Both sentences are correct. The difference is the level of formality.
When Should You Use Formal English?
Use formal English when communicating in professional, academic, official, or unfamiliar situations.
Common examples include job applications, business emails, academic writing, presentations, reports, and communication with customers or senior colleagues.
When Should You Use Informal English?
Informal English is appropriate for relaxed communication with friends, family members, classmates, and people you know well.
It is also widely used in text messages, casual conversations, personal emails, and social media.
Formal vs Informal Vocabulary: Quick Comparison
| Formal English | Informal English |
|---|---|
| professional | conversational |
| more structured | more relaxed |
| fewer contractions | contractions are common |
| precise vocabulary | everyday vocabulary |
| fewer slang expressions | slang may be used |
| common in academic writing | common in conversation |
Frequently Asked Questions
What is formal vocabulary?
Formal vocabulary includes words and expressions typically used in professional, academic, business, and official communication.
What is informal vocabulary?
Informal vocabulary includes everyday words and expressions commonly used in casual conversations and personal communication.
What is an example of formal and informal vocabulary?
An example is assist and help. “Assist” is more formal, while “help” is neutral and commonly used in everyday English.
Is informal English grammatically incorrect?
No. Informal English is not necessarily incorrect. It simply suits different contexts from formal English.
Should I use formal vocabulary in academic writing?
Generally, yes. Academic writing usually requires clear, precise, and relatively formal language, although unnecessarily complicated vocabulary should be avoided.
Final Thoughts
Learning formal vs informal vocabulary helps you adjust your English to different situations. You do not always need to choose the most formal word. The important skill is knowing which level of formality is appropriate for your audience and purpose.
By learning common formal and informal word pairs and practicing them in context, you can communicate more naturally and effectively in both professional and everyday English.