Collocations for incompetence - noun

gross, rank
sheer, utter
incredible, unbelievable
alleged
administrative, bureaucratic, government, managerial, police
economic, professional, technical

demonstrate
tolerate
I will not tolerate your incompetence any longer!

accuse sb/sth of

incompetence at, incompetence in
incompetence in writing

incompetence on the part of
Several officers had alleged incompetence on the part of the general.