* Simple: The car engine was sluggish after sitting idle all winter.
* Descriptive: After a heavy lunch, I felt sluggish and unmotivated to go for a walk.
* Figurative: The economy remained sluggish, showing little sign of recovery.
* Contrasting: Despite the hot weather, the hikers were surprisingly not sluggish but energetic and upbeat.
Let me know if you'd like more examples!