
Incapable
Emotional Weight
Incapable often carries a suggestion of failure or deficiency.

After many tries, he felt incapable of success.
Personal Limitations
Use it to describe a person's limits without specifying a reason.

They're incapable of carrying heavy weights.
Emphasizes Inability
Highlight someone's inability in a specific situation.

He's incapable of committing to any plan.
Compare with
AwkwardClumsyIncompetentIneptUnable
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