- Today's Word
Lassitude
LAS-ih-tood
Definition
(noun) A state of physical or mental weariness; a pervasive lack of energy or enthusiasm that resists ordinary efforts at recovery.
Example
The weeks after the project ended left her in a lassitude she hadn’t anticipated — the adrenaline gone, the purpose gone, the energy to find either absent.
Word Origin
Lassitude derives from the Latin lassitudo, meaning “weariness” or “faintness,” from lassus — “tired” or “faint.” The same root gives us alas — an exclamation of weariness and resignation — and is related to the Proto-Indo-European root meaning “to let go” or “to slacken.” It entered English in the 16th century, used in medical contexts to describe a specific symptom — profound, pervasive tiredness that resisted rest — before expanding into its broader sense of a weariness that goes deeper than sleep can reach.
Fun Fact
Post-event lassitude — the profound exhaustion that follows the completion of a major goal — is well documented in psychology and goes by several names depending on context. Athletes call it post-Olympic depression; surgeons describe it after long operations; writers report it after finishing books. The phenomenon reflects a neurological reality: sustained high performance depletes dopamine and norepinephrine reserves faster than ordinary rest replenishes them, producing a lassitude that feels disproportionate to the circumstances. The cruel irony is that the more successfully you achieve something, the more completely the achievement hollows you out — which is either a design flaw in human neurochemistry or a very efficient argument for having a next project ready.