Interminable (adjective)

1. Endless, seemingly without end.
2. Extremely long and tedious.

Origin:

From the latin word interminabilis, from inter- (between) + minari (to threaten).

Examples:

1. The interminable wait in line was enough to make anyone lose patience.
2. The meeting felt interminable as it seemed to go on forever.
3. The interminable lecture put many of the students to sleep.
4. He found the process of filling out the paperwork to be interminable.
5. The traffic jam was interminable and we were stuck on the highway for hours.