excruciating (adj.)

• acute
• afflictive
• agonizing
• atrocious
• biting
• consuming
• cruel
• distressful
• distressing
• exquisite
• extreme
• grave
• hard
• harrowing
• harsh
• heartbreaking
• heartrending
• hurtful
• insufferable
• intense
• keen
• painful
• paroxysmal
• piercing
• poignant
• pungent
• racking
• rending
• severe
• sharp
• shooting
• spasmodic
• stabbing
• stinging
• tearing
• torturing
• torturous
• unbearable
• unendurable
• vivid