asthenia

As a noun asthenia

is (medicine) weakness; loss of strength.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between asthenia and depression

is that asthenia is (medicine) weakness; loss of strength while depression is depression (area that is lower than its surroundings).

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.

As nouns the difference between deficiency and asthenia

is that deficiency is (uncountable) inadequacy or incompleteness while asthenia is (medicine) weakness; loss of strength.

As nouns the difference between asthenia and lethargy

is that asthenia is weakness; loss of strength while lethargy is a condition characterized by extreme fatigue or drowsiness, or prolonged sleep patterns.

As nouns the difference between fatigue and asthenia

is that fatigue is a weariness caused by exertion; exhaustion while asthenia is weakness; loss of strength.

As a verb fatigue

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

As nouns the difference between asthenia and foible

is that asthenia is (medicine) weakness; loss of strength while foible is a quirk, idiosyncrasy, or mannerism; unusual habit or way (usage is typically plural), that is slightly strange or silly.

As an adjective foible is

(obsolete) weak; feeble.

As nouns the difference between asthenia and sthenia

is that asthenia is weakness; loss of strength while sthenia is strength, vigour or vitality.

As a noun asthenia

is weakness; loss of strength.

As an adjective asthenic is

characterized by, or pertaining to, debility; weak; debilitating.