incompetent Definition

incompetent
adj

1. Lacking the necessary skill, ability or qualifications, especially for a job.

Thesaurus: incapable, inadequate, incapacitated, ineffective, inefficient, inept, inexpert, insufficient, unfit, useless; Antonym: skilful, able.
2. Not legally qualified or competent.

noun

1. An incompetent person.

Derivative: incompetence
noun

Derivative: incompetently
adverb

Etymology: 16c.