Lacking passion, enthusiasm, or commitment; listless, apathetic; unwilling to make the effort to do something. Obsolete.

Given to sleep; lethargic, heavy.

Having, showing, or characteristic of the temperament formerly believed to result from a predominance of phlegm among the bodily humours; not easily…

Of persons, their actions, etc.: †(a) destitute of relish or inclination for some specified object or pursuit; const. of (obsolete); (b)…

Listless, sluggish, slothful.

Not inclined towards activity or exertion; lazy; listless; = unlusty, adj. 1.

= phlegmatic, adj. 2. Now rare.

Tired, lazy.

figurative. Disinclined to act through moral weakness or indolence; characterized by laziness or apathy; passively indifferent to or accepting of a…

Disinclined to work or exert oneself; sluggish, lazy; inactive. Cf. restive, adj. 2. Now regional.

Habitually or naturally inactive; indisposed or unable to act; hence, sluggish, slothful. Of persons (or animals).

Inert.

That is or has been stupefied (in various senses); (now) esp. in a state of astonishment, shock, etc.; stunned.

transferred. Affected with inertness or inactivity; dull, sleepy, sluggish, apathetic.

Slothful, inactive. Obsolete.

= torpid, adj.

figurative. Wanting in animation or vigour; inactive; slow, sluggish; dull; stupefied; apathetic.

Torpid.

Lacking in energy or enterprise. Obsolete.

Of persons, animals, and (transferred) moving things: Inactive, sluggish, slow, not inclined for or capable of action. Also of mental faculties.

figurative. Monotonous, dull; inactive, unchallenging.

Lacking energy or enterprise.

(un-, prefix1 affix 1.)

Sluggish, dull, spiritless. Also as adv.

Of a person or a person's mind, etc.: not quick to take action, not quick in thinking; disinclined to be active or enterprising. Now rare.

Not energetic; without energy.

transferred. Drowsy, lethargic.

Inclined to moon about or act in a listless or aimless manner; given to mooning or wistful contemplation; dreamily distracted.

Characterized by dreaminess; aimless, listless.

Appearing as if affected with narcolepsy; lethargic, somnolent.

= vegged-out, adj.