1. having no end; continuing forever or for a very long time
2. seeming to last forever; very long and boring or tiring
Usage: often used to express frustration or impatience

Examples

• The desert seemed to stretch in endless miles of sand.
• She had endless patience with her young students.
• The meeting felt endless and everyone was getting restless.
• There are endless possibilities for your career.
• The children asked endless questions about the animals.
• We waited in an endless line at the amusement park.
• His endless complaining annoyed his coworkers.