useless
This term conveys a sense of total failure in utility or efficacy. It is often used to describe objects that are broken or obsolete, but it carries a stronger emotional weight when applied to people, where it suggests a feeling of inadequacy or helplessness in a specific crisis.
In a pragmatic sense, it describes actions that are futile, meaning that no matter the effort exerted, the outcome will remain unchanged. This distinguishes it from words like inefficient, which implies a waste of resources rather than a complete lack of result.
Meanings
Not fulfilling or capable of fulfilling a purpose or intended function.
The old key was useless because the lock had been replaced.
Ineffective or producing no significant result.
It is useless to argue with someone who refuses to listen to reason.
Lacking in skill or competence; completely ineffective in a particular role.
He is a useless assistant who cannot even file a document correctly.