unable to perform

Meanings

1. 1phrasefixed phraseformal

   not having the ability, power, or right to do a task or duty.

   Grammar: Used after be or feel: the machine is unable to perform; it takes no object of its own.

   Patterns

   • be unable to perform something
   • feel unable to perform a duty
   • unable to perform at a usual level

   The injured player was unable to perform at his usual level.

   After the update, the printer was unable to perform its basic functions.

   She felt unable to perform the duties listed in her contract.

2. 2phrasefixed phrasetechnical

   not working properly, so a device, system, or body part cannot do what it should.

   Grammar: Often used of machines, software, or organs; it describes a state, not a single action.

   Patterns

   • be unable to perform a function
   • unable to perform a task
   • unable to perform properly

   The old laptop was unable to perform even simple tasks.

   The damaged valve was unable to perform its normal function.

   Without enough memory, the app is unable to perform reliably.

Common combinations

unable to perform a duty

He was unable to perform his duties while he was ill.

unable to perform a task

The robot was unable to perform the task without help.

unable to perform at work

Stress left her unable to perform at work.

physically unable to perform

The report said he was physically unable to perform heavy lifting.

unable to perform a function

The kidneys were unable to perform their usual function.

Synonyms and how they differ

incapable of

Stronger and more permanent-sounding; it often suggests a basic lack of ability rather than a temporary situation.

not able to

The plain, everyday version; use it in speech when unable to perform sounds too formal.

unfit to

Focuses on not being suitable or allowed, often for health or legal reasons, rather than on ability.

Opposites

Word family

performance noun

how well someone or something does a task or activity.

perform verb

to carry out a task, duty, or action.

performer noun

a person who takes part in a performance or does a task.

Commonly confused: unable to perform or unable to perform?

Practice

Make it your own

Write a sentence using “unable to perform”, then check it and compare it with the examples above.

Explore more words