incompetent
adjective(in-com-pe-tent)
legally not qualified or sufficient
Examples:
Incompetent witnesses. 
incompetent
noun(in-com-pe-tent)
someone who is not competent to take effective action
Synonyms: incompetent person, 
incompetent
adjective(in-com-pe-tent)
not meeting requirements
incompetent
adjective(in-com-pe-tent)
not doing a good job
Examples:
Incompetent at chess. 
incompetent
adjective(in-com-pe-tent)
showing lack of skill or aptitude
incompetent
adjective(in-com-pe-tent)
not qualified or suited for a purpose
Examples:
An incompetent secret service. 
The filming was hopeless incompetent.