To take a long time to leave or disappear. (Cambridge Dictionary)
To be slow in parting or in quitting something: Tarry. (Merriam – Webster)
To remain alive although gradually dying. (Merriam – Webster)
To remain existent although often waning in strength, importance, or influence. (Merriam – Webster)
To be slow to act: Procrastinate. (Merriam – Webster)
When something such as an idea, feeling, or illness lingers, it continues to exist for a long time, often much longer than expected. (Collins Dictionary)
If you linger somewhere, you stay there for a longer time than is necessary, for example because you are enjoying yourself. (Collins Dictionary)
Stay in a place longer than necessary because of a reluctance to leave. (Oxford Dictionaries)
(linger over) Spend a long time over (something). (Oxford Dictionaries)
Be slow to disappear or die. (Oxford Dictionaries)
To remain or stay in a place longer than is usual or expected, as if from reluctance to leave. (Dictionary.com)
To remain alive; continue or persist, although gradually dying, ceasing, disappearing, etc.: (Dictionary.com)
To dwell in contemplation, thought, or enjoyment. (Dictionary.com)
Why Painful Memories Linger.
Why Some Emotions Linger and Others Fade Away Fast.