Weariness, fatigue; a weak or exhausted state or feeling; a sluggish relaxation of body or mind.
→ Synonyms of lassitude include listlessness, lethargy (LETH-ur-jee), debility, indolence (IN-duh-lints), inertia (i-NUR-shuh), enervation (EN-ur-VAY-shin), torpor (TOR-pur), and languor (LANG-gur).
Would you like an ultragrandiloquent synonym for lassitude? How about oscitancy? Oscitancy (AHS-i-tin-see) comes through the Latin oscitare, to yawn, gape, open the mouth, from the Latin os, the mouth. Literally, oscitancy means the act of yawning or gaping; figuratively, it means sleepiness, drowsiness, or sluggishness.
The Latin os, meaning “the mouth,” is the source of another delightful grandiloquent word that is entirely unrelated to this discussion—but you don’t mind if I’m desultory, do you? (As I mentioned in the discussion of discursive, word 50 of Level 6, desultory, pronounced DES-ul-TOR-ee, means skipping or leaping from one subject to another in a disconnected way.) At any rate, this Latin os, the mouth, is also the source of the unusual English word osculation (AHS-kyuh-LAY-shin). Osculation denotes a pleasant act, something we all enjoy. With that clue, and knowing that this act has something to do with the mouth, can you guess what osculation means? If you’re thinking the act of kissing, then you are a sagacious word sleuth indeed.
Now let’s get back to our keyword, lassitude, which comes from the Latin lassitudo, weariness, exhaustion. In modern usage, lassitude denotes a weak or exhausted state or feeling; a sluggish relaxation of body or mind. Surfeiting yourself at the dinner table can cause lassitude, and on sultry summer days we often experience lassitude.
Fatigue, weariness, and lassitude are close in meaning. Fatigue usually is the result of physical or mental exertion; you feel fatigue after ten or twelve hours of assiduous labor. According to the Century Dictionary (1914), weariness is “the result of less obvious causes, as long sitting or standing in one position, importunity from others, delays, and the like. Fatigue and weariness are natural conditions,” says the Century, “from which one easily recovers by rest.” Lassitude is “the result of greater fatigue or weariness than one can well bear, and may be of the nature of ill health. The word may, however, be used in a lighter sense.” To illustrate that lighter sense, the Century quotes these lines from the eighteenth-century British poet, essayist, and physician John Armstrong: “Happy he whose toil/Has o’er his languid, pow’rless limbs diffus’d/a pleasing lassitude.”