Tedium (noun)

1. The feeling of being bored and restless because of a lack of interest or excitement.
2. The quality of being tedious; monotony.

Origin:

Late 16th century: from latin taedium, from taedere 'be weary of'.

Examples:

1. The long, monotonous journey across the desert was filled with tedium.
2. The speaker's dull, repetitive talk was met with tedium by the audience.
3. The tedious, mundane task was finally complete.
4. The tedious lecture was a snooze fest.
5. The tedious workday was a grind.