Longman Dictionary of Contemporary English homepage

insubordination

 noun
     
Related topics: Military
in‧sub‧or‧di‧nation [uncountable] formal
PM when someone refuses to obey a person who has more authority than them [= disobedience]:
Howell was fired for gross insubordination.
—insubordinate adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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