lassitude

As nouns the difference between lassitude and asthenosphere

is that lassitude is lethargy or lack of energy; fatigue while asthenosphere is (geology) the zone of the earth's upper mantle, below the lithosphere.

Boredom is a related term of lassitude.

As nouns the difference between boredom and lassitude

is that boredom is (uncountable) the state of being bored while lassitude is lethargy or lack of energy; fatigue.

Lassitude is a related term of slothfulness.

As nouns the difference between lassitude and slothfulness

is that lassitude is lethargy or lack of energy; fatigue while slothfulness is (uncountable) the state or quality of being slothful.

As a noun lassitude

is lethargy or lack of energy; fatigue.

As an adjective listless is

lacking energy, enthusiasm, or liveliness.

As nouns the difference between concomitant and lassitude

is that concomitant is something happening or existing at the same time while lassitude is lethargy or lack of energy; fatigue.

As an adjective concomitant

is accompanying; conjoined; attending; concurrent.

As nouns the difference between lassitude and equanimity

is that lassitude is lethargy or lack of energy; fatigue while equanimity is the state of being calm, stable and composed, especially under stress.

As nouns the difference between vigor and lassitude

is that vigor is while lassitude is lethargy or lack of energy; fatigue.

As a verb tired

is (tire).

As an adjective tired

is in need of some rest or sleep.

As a noun lassitude is

lethargy or lack of energy; fatigue.

As nouns the difference between lassitude and asthenia

is that lassitude is lethargy or lack of energy; fatigue while asthenia is weakness; loss of strength.

Lassitude is a related term of indifference.

As nouns the difference between lassitude and indifference

is that lassitude is lethargy or lack of energy; fatigue while indifference is indifference, uncaringness.