gross incompetence

Translations
грубая некомпетентность
The project failed due to gross incompetence.
Проект провалился из-за грубой некомпетентности.
Definitions
Gross incompetence refers to a severe lack of ability, skill, or judgment in performing a task or duty, often resulting in significant errors or failures. It implies a level of negligence or unprofessionalism that is far beyond what is considered acceptable.
Words
incompetence

noun
некомпетентность
gross

adjective
грубый