For the sense of "thick and sticky":
* Honey: This is a classic example of a viscous substance. It flows slowly and clings to surfaces.
* Molasses: Similar to honey, but even thicker and slower-moving.
* Glue: A substance that sticks to surfaces and resists flowing.
* Syrup: A liquid that flows slowly and coats surfaces.
* Mud: A thick mixture of dirt and water that resists flowing.
For the sense of "resistant to flow":
* Traffic jam: Cars moving slowly and struggling to progress.
* A slow-moving river: Water flowing slowly due to obstacles or lack of momentum.
* A bureaucratic process: An intricate system with many steps that slows down progress.
* A dense forest: Thick vegetation that makes movement difficult.
* A sticky situation: A difficult situation that's hard to get out of.
For the sense of "having a high viscosity":
* Thick paint: Difficult to spread and requires effort to move.
* Heavy cream: A dense, viscous liquid that resists separation.
* Motor oil: A thick oil designed to lubricate moving parts.
* Shampoo: A liquid that is typically thick and creamy to provide a good lather.
The best analogy will depend on what aspect of "viscous" you want to highlight.
