pent-up

adjective2

1. •
   Not expressed.

   • I remember, particularly, how, in his speech here, he referred to what his family had suffered in Kansas, without ever giving the least vent to his pent-up fire. — 1859
2. •
   Repressed or suppressed, especially of emotions or impulses.

   • He punched his pillow and screamed at the top of his lungs about all the pent-up frustrations from the day.