Only vs Simply

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

Only

Top 1,000 (very common) A1 adjective

Simply

Top 1,000 (very common) B1 adverb

	Only	Simply
Pronunciation	🇬🇧 /["/ˈəʊnli/"]/ 🇺🇸 /["/ˈəʊnli/"]/	🇬🇧 /["/ˈsɪmpli/"]/ 🇺🇸 /["/ˈsɪmpli/"]/
Meaning	just one or a single type of something	in a straightforward way
Example	She is the only person I trust.	You can simply follow the instructions to complete the task.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 1,000 (very common)
CEFR level	A1	B1
Part of speech	adjective	adverb
Collocations	only one, only child, only option, only when, only time	simply say, simply put, simply amazing, simply stated, simply because
Antonyms	multiple, various, some	complicated, complex
Common mistakes	Using 'only' in the wrong position, changing the meaning., Confusing 'the only' with 'only'., Overusing 'only', leading to awkward sentences.	Using 'simply' in overly complex sentences., Confusing 'simply' with 'just' in different contexts., Misplacing 'simply' in a sentence, making it unclear.
Usage notes	Use 'only' to restrict meaning. It’s often used to clarify that nothing else is included. Avoid using it excessively, as it can sound limiting or exclusive.	Use 'simply' to emphasize clarity or to say something in an easy way. It’s neutral, so it can be used in various contexts, but avoid in formal writing when discussing complex topics.

See it in real clips

Top Gear › S1 E1

Then we simply fold the seats down,

simply because he knew how to handle a knife.

Sherlock › S1 E1

This petty feud between us is simply childish. People will suffer.

Top Gear › S1 E1

Then we simply fold the seats down,

simply because he knew how to handle a knife.

Simply

Frequently asked questions: Only vs Simply

What's the difference between Only and Simply?

Only: just one or a single type of something Simply: in a straightforward way

Which is more advanced: Only and Simply?

Simply is the highest level, at B1, on the CEFR scale.

Are Only and Simply the same CEFR level?

Only: A1, Simply: B1 on the CEFR scale.

What part of speech are Only and Simply?

Only: adjective, Simply: adverb.

Can you show an example of each?

Only: She is the only person I trust. Simply: You can simply follow the instructions to complete the task.

Can I use Only and Simply interchangeably?

Not always. Only and Simply 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.