Often implies frustration or impatience with something taking too long. Sitting through the interminable meeting, she sighed in exasperation.
Pro Tip 2/3
Subjectivity
What feels 'interminable' to someone might be different for another; it's subjective. His explanation was clear, but to those uninterested, it felt interminable.
Pro Tip 3/3
Literary Usage
Used in literature to set a scene or mood, indicating prolonged action or setting. The interminable horizon stretched beyond sight, barren and desolate.