Capable vs Effective

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

Capable

Top 2,000 (common) B2 adjective

Effective

Top 1,000 (very common) B1 adjective

Most common: Effective

	Capable	Effective
Pronunciation	🇬🇧 /["/ˈkeɪpəbl/"]/ 🇺🇸 /["/ˈkeɪpəbl/"]/	🇬🇧 /["/ɪˈfektɪv/"]/ 🇺🇸 /["/ɪˈfektɪv/"]/
Meaning	able to do something; having the skill or power to do it	Works well or gets good results.
Example	She is quite capable of handling difficult situations on her own.	The training program was very effective in improving employee skills.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 1,000 (very common)
CEFR level	B2	B1
Part of speech	adjective	adjective
Collocations	appear, be, feel, fully, more than, perfectly, be, seem, extremely, fairly, very	be, look, prove, extremely, fairly, very, at, in, be, become, remain, fully, partially, directly
Antonyms	incapable, unable	ineffective, unproductive, useless
Common mistakes	Confused about using 'capable of' versus 'capable for'., Using 'capability' instead of 'capable' incorrectly., Using 'capable' as an adverb (it’s an adjective).	'Effective' is often confused with 'efficient', which means doing something in a good way without wasting time., Learners sometimes use 'effectively' when 'effective' is needed, which is a different grammatical form., Some people mistakenly use 'effective' as a noun, but it's an adjective.
Usage notes	Use 'capable' to describe someone or something that has the ability to achieve a task. It's suitable in both personal and professional contexts. Avoid using it in overly casual situations.	Use 'effective' when describing something that produces the desired outcome. It's suitable for both written and spoken contexts but avoid using it in overly casual settings.

See it in real clips

House Of Dragons › S1 E1

Of course, no maester's capable of rendering an opinion

Breaking Bad › S1 E2

capable of acting out of mutual self-interest, yes?

Breaking Bad › S1 E7

And the Gustav was capable of firing a 7-ton shell

House Of Dragons › S1 E1

Of course, no maester's capable of rendering an opinion

Breaking Bad › S1 E2

capable of acting out of mutual self-interest, yes?

Capable

Frequently asked questions: Capable vs Effective

What's the difference between Capable and Effective?

Capable: able to do something; having the skill or power to do it Effective: Works well or gets good results.

Which is more common: Capable and Effective?

Effective is the most common in everyday English.

Which is more advanced: Capable and Effective?

Capable is the highest level, at B2, on the CEFR scale.

Are Capable and Effective the same CEFR level?

Capable: B2, Effective: B1 on the CEFR scale.

What part of speech are Capable and Effective?

Capable: adjective, Effective: adjective.

Can you show an example of each?

Capable: She is quite capable of handling difficult situations on her own. Effective: The training program was very effective in improving employee skills.

Can I use Capable and Effective interchangeably?

Not always. Capable and Effective 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.