agonizing (adj.)

• acute
• afflictive
• atrocious
• biting
• consuming
• cruel
• distressful
• distressing
• excruciating
• exquisite
• fierce
• grave
• hard
• harrowing
• harsh
• heartbreaking
• heartrending
• hurtful
• intense
• painful
• paroxysmal
• piercing
• poignant
• pungent
• racking
• rending
• severe
• sharp
• shooting
• spasmodic
• stabbing
• stinging
• tearing
• tormented
• tortured
• torturing
• torturous
• vehement
• violent