incapable

Definitions

Lacking the necessary ability, power, or fitness to accomplish a specified task.

Not having the capacity or inclination to perform a particular action or behave in a certain way.

Examples

He felt completely incapable of making such a difficult decision on his own.

The old machine is incapable of processing data at the speed required for this project.

Synonyms

incompetent unable powerless inept unfit helpless ineffectual

Antonyms

capable competent able qualified proficient skilled efficient