Viscous (adjective)

1. Having a thick, sticky consistency between solid and liquid, like molasses or honey.
2. Resistant to flowing or moving smoothly.

Origin:

From latin word "viscosus" meaning "sticky".

Examples:

1. The paint was so viscous that it was difficult to apply evenly.
2. The syrup was viscous and clung to the spoon.
3. The oil was viscous and would not flow easily through the engine.
4. The lava was so viscous that it formed a volcano.
5. The mucus was viscous and difficult to clear from the throat.