Comparative:
* More sluggish: Suggests a lack of energy and movement.
* More indolent: Emphasizes a love of ease and avoidance of effort.
* Lazier: The most common and direct comparison.
* More slothful: Implies a strong aversion to work and activity.
* More lethargic: Describes a state of weariness and apathy.
* More languid: Suggests a graceful, relaxed, and possibly charming laziness.
* More idle: Highlights a lack of purposeful activity.
* More remiss: Focuses on negligence or failing to do something that should be done.
Superlative:
* Most sluggish: The most inactive and lethargic.
* Most indolent: The most prone to inactivity and relaxation.
* Laziest: The most unwilling to exert oneself.
* Most slothful: The most dedicated to avoiding work.
* Most lethargic: The most apathetic and drained of energy.
* Most languid: The most gracefully and luxuriously inactive.
* Most idle: The most engaged in doing nothing.
* Most remiss: The most negligent and neglectful of responsibilities.
Note: The specific word you choose will depend on the context and the specific nuance you wish to convey.