incompetent person

English Thesaurus

1. someone who is not competent to take effective action (noun.person)

hypernym	:	unskilled person,
definition	:	a person who lacks technical training (noun.person)

hyponym	:	blunderer, botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler,
definition	:	someone who makes mistakes because of incompetence (noun.person)

hyponym	:	slouch,
definition	:	an incompetent person; usually used in negative constructions (noun.person)