persistent

This word carries a duality of perception depending on the subject. When applied to a person's character, it often suggests an admirable quality of tenacity and grit, portraying someone who refuses to give up on a goal despite repeated failures. When applied to a situation or a physical symptom, it takes on a more negative or frustrating tone. It describes something unwanted, such as a smell, a noise, or an illness, that refuses to go away, creating a sense of irritation or chronic endurance.