sluggishness

As a noun sluggishness

is the property of being sluggish, unable or unwilling to act quickly.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between slackness and sluggishness

is that slackness is the state of being slack; the quality of having slack while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

Unconcern is a related term of sluggishness.

As nouns the difference between unconcern and sluggishness

is that unconcern is (nonstandard|obsolete) indifference or lack of concern while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

Insensibility is a related term of sluggishness.

As nouns the difference between insensibility and sluggishness

is that insensibility is the property of being insensible while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

As nouns the difference between laziness and sluggishness

is that laziness is the quality of being lazy while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

As nouns the difference between supineness and sluggishness

is that supineness is the state of being supine while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

Stoicism is a related term of sluggishness.

As nouns the difference between stoicism and sluggishness

is that stoicism is a school of philosophy during the roman empire that emphasized reason as a means of understanding the natural state of things, or logos, and as a means of freeing oneself from emotional distress while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

As nouns the difference between fatigue and sluggishness

is that fatigue is a weariness caused by exertion; exhaustion while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

As a verb fatigue

is to tire or make weary by physical or mental exertion.

Idleness is a synonym of sluggishness.

As nouns the difference between idleness and sluggishness

is that idleness is the state of being idle; inactivity while sluggishness is the property of being sluggish, unable or unwilling to act quickly.

As nouns the difference between unfeelingness and sluggishness

is that unfeelingness is the state or condition of being unfeeling while sluggishness is the property of being sluggish, unable or unwilling to act quickly.