Incapable vs. unable: what’s the difference?
The short answer
Incapable often implies an inherent or intrinsic lack of ability, suggesting a more permanent or characteristic inability. Unable is typically used to describe a temporary or situational lack of ability due to specific circumstances.
What they have in common
Both incapable and unable describe a lack of ability or capacity to do something. They are adjectives used to indicate that someone or something cannot perform a specific action or function.
Examples
incapable
- She is incapable of lying.
- The device is incapable of processing large amounts of data.
- He felt incapable of making a decision at that moment.
unable
- He was unable to attend the meeting.
- They are unable to reach an agreement.
- She is unable to lift heavy objects due to her injury.
Which one is more common?

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