Which adjective means impossible to stop or prevent?

• A. Impetuous
• B. Inexorable
• C. Insipid
• D. Laconic

Answer: (B)

This item tests understanding of a word that means something cannot be stopped or prevented. Inexorable describes a force, process, or outcome that proceeds relentlessly, without being slowed, diverted, or halted. You can picture it in phrases like the inexorable march of time or an inexorable fate—things that keep moving forward no matter what.

Impetuous, by contrast, means acting quickly and without thought or care, not something unstoppable. Insipid means dull or bland. Laconic means using few words. So the term that best captures the idea of something unavoidable and unstoppable is inexorable.