разочарование во всем, постепенное, разъедающее

You're keeping in step 
In the line 
Got your chin held high and you feel just fine 
Because you do 
What you're told 
But inside your heart it is black and it's hollow and it's cold 

Just how deep do you believe? 
Will you bite the hand that feeds? 
Will you chew until it bleeds? 
Can you get up off your knees? 
Are you brave enough to see? 
Do you want to change it?