Adhere vs Attach vs Stick

When to use each in English, with meaning, register, and examples.

Adhere

FormalTop 3,000 (common)C1verb

Attach

Top 1,000 (very common)B1verb

Stick

Top 1,000 (very common)B1verb
Most formal: Adhere
 AdhereAttachStick
Pronunciation🇬🇧 /["/ədˈhɪə(r)/","/ədˈhɪəz/","/ədˈhɪəd/","/ədˈhɪərɪŋ/"]/🇺🇸 /["/ədˈhɪr/","/ədˈhɪrz/","/ədˈhɪrd/","/ədˈhɪrɪŋ/"]/🇬🇧 /["/əˈtætʃ/","/əˈtætʃɪz/","/əˈtætʃt/","/əˈtætʃɪŋ/"]/🇺🇸 /["/əˈtætʃ/","/əˈtætʃɪz/","/əˈtætʃt/","/əˈtætʃɪŋ/"]/🇬🇧 /["/stɪk/","/stɪks/","/stʌk/","/ˈstɪkɪŋ/"]/🇺🇸 /["/stɪk/","/stɪks/","/stʌk/","/ˈstɪkɪŋ/"]/
MeaningTo stick to something or follow it closely.to connect or fasten something to another thingA thin piece of wood or similar material.
ExampleOnce in the bloodstream, the bacteria adhere to the surface of the red cells.Please attach the document to your email before sending it.I need to stick this poster on the wall.
RegisterFormalNeutralNeutral
How commonTop 3,000 (common)Top 1,000 (very common)Top 1,000 (very common)
CEFR levelC1B1B1
Part of speechverbverbverb
Collocationsclosely, firmly, rigidly, tofirmly, securely, loosely, toclose, closely, rigidly, in, into, on, tend to, decide to, be determined to, close, closely, rigidly, in, into, on, tend to, decide to, be determined to
Antonymsdetach, separate, disobeydetach, removeblock, obstacle
Common mistakesConfused with 'adhere to' vs 'stick to' — they are not interchangeable., Using 'adhere' without a clear object — it needs to specify what is being adhered to., Assuming 'adhere' can only refer to physical sticking — it can also refer to following rules.Confused with 'detach' – forgetting to use the right prefix., Using 'attaching' incorrectly in passive constructions., Not following with an object, e.g., 'attach to' instead of 'attach the document to'.Confused with 'stick' as a verb and its different meanings., Using it in plural form when referring to the concept generally., Mispronouncing the word, particularly in different dialects.
Usage notesUsed in formal contexts, often in legal or technical language. It's appropriate when discussing rules, guidelines, or sticky substances, but less common in casual conversation.Use 'attach' for both physical and abstract connections, like emails or documents. Less common in very formal writing. Avoid with informal language unless using slang.Used to describe a natural object found outdoors or as a tool. Avoid in formal contexts when describing something more substantial.

Frequently asked questions: Adhere vs Attach vs Stick

What's the difference between Adhere, Attach, and Stick?

Adhere: To stick to something or follow it closely. Attach: to connect or fasten something to another thing Stick: A thin piece of wood or similar material.

Which is more formal: Adhere, Attach, and Stick?

Adhere is the most formal of these.

Which is more advanced: Adhere, Attach, and Stick?

Adhere is the highest level, at C1, on the CEFR scale.

Are Adhere, Attach, and Stick the same CEFR level?

Adhere: C1, Attach: B1, Stick: B1 on the CEFR scale.

What part of speech are Adhere, Attach, and Stick?

Adhere: verb, Attach: verb, Stick: verb.

Can you show an example of each?

Adhere: Once in the bloodstream, the bacteria adhere to the surface of the red cells. Attach: Please attach the document to your email before sending it. Stick: I need to stick this poster on the wall.

Can I use Adhere, Attach, and Stick interchangeably?

Not always. Adhere, Attach, and Stick are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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