Infernal/ɪnˈfɜːrnl/ Definition 1 of 3Pro Tip 1/3Colloquial Usage Common in spoken language when expressing frustration or annoyance in everyday situations. My laptop is making that infernal beeping again! Pro Tip 2/3Hyperbolic Expression Used for emphasis, not to be taken literally; doesn't actually relate to hell. This infernal car won't start on cold mornings! Pro Tip 3/3Negative Connotations Implies a negative and often unbearable experience or sensation. Can someone shut off that infernal alarm?