1. the quality or state of having no end; infinite duration or extent
2. the quality of seeming to go on forever; tedious or monotonous continuation

Examples

• The endlessness of the desert stretched before the travelers.
• She stared at the endlessness of the night sky, contemplating the vastness of space.
• The endlessness of the meeting made everyone restless.
• He felt trapped by the endlessness of his daily routine.
• The ocean's endlessness inspired both wonder and fear in the sailors.
• The endlessness of waiting for news was unbearable.