This is the 14514th most frequent Polish word.
przewlekle
"Przewlekle" means "chronically" or "persistently."
Used here as an adverb describing a condition (like fatigue) with a protracted nature.
Przewlekle zmęczenie może być objawem stresu.
Chronic fatigue may be a symptom of stress.
Functions as an adverb to emphasize the recurring nature of the subject's behavior.
On przewlekle opóźnia swoje projekty.
He chronically delays his projects.
Describes persistent and ongoing medical conditions, functioning as an adverb.