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Which word best describes a substance that is thick and sticky?

  1. Fluid

  2. Viscous

  3. Thin

  4. Airy

The correct answer is: Viscous

The term that best describes a substance that is thick and sticky is "viscous." Viscosity is a measure of a fluid's resistance to flow, and a high viscosity indicates a thicker, stickier substance. This property is common in liquids such as honey or molasses, which flow more slowly and possess a substantial thickness compared to thinner substances. In contrast, the other terms do not accurately capture the characteristics of a thick and sticky substance. "Fluid" is a general term that can refer to any liquid or gas; it does not imply thickness or stickiness. "Thin" refers to a substance that is not dense and flows easily, which is the opposite of what is being described here. "Airy" suggests a light and buoyant quality, often used to describe things that are delicate or not heavy, which again does not align with the concept of thickness or stickiness.