Pressure

noun a deep or seemingly bottomless chasm

• The submarine descended into the abyss of the ocean, reaching depths never before explored.
• I feel like I'm falling into an abyss of stress with all these deadlines looming.
• When I lost my job, I felt like I was staring into the abyss of uncertainty.
• Her depression felt like an abyss, swallowing up all hope and light in her life.

adjective describes a person or thing that requires too much attention, effort, or time

• The job requirements were deemed over-demanding by many applicants.
• She always sets over-demanding expectations for her team.
• My boss is so over-demanding, it's ridiculous.
• The weight of the world felt over-demanding on his shoulders.