A bronchiectasis inflammatory endotype characterized by excessive neutrophil-driven airway inflammation with elevated levels of neutrophil-associated mediators including neutrophil elastase (NE), IL-8, and TNF-alpha. This is the most common inflammatory phenotype of bronchiectasis, strongly associated with chronic Pseudomonas aeruginosa infection, severe disease, frequent exacerbations, and poor prognosis. The disease or phenotype is Experimental Factor Ontology entry EFO_0920035 (neutrophilic bronchiectasis). Also known as: neutrophil-predominant bronchiectasis, neutrophilic bronchiectasis endotype.