lingerer

One who lingers.

linger

1. (intransitive) To stay or remain in a place or situation, especially as if unwilling to depart or not easily able to do so.
2. (intransitive) To remain alive or existent although still proceeding toward death or extinction; to die gradually.
3. (idiomatic, intransitive, often) To consider or contemplate for a period of time; to engage in analytic thinking or discussion.

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Etymology

From linger + -er.

Synonyms

dawdler

loiterer

laggard

postponer

slouch