The definition of burdensome is something that is hard to deal with, or that places too great of expectations.
Providing round-the-clock care to your neighbor who you don't like very much is an example of a burdensome task.
hard to bear; heavy; oppressive
- Weighing much or hard to carry; heavy.
- Causing hardship or distress.
(comparative more burdensome, superlative most burdensome)
burden + -some