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lethargy [lethargy 词源字典]: lethargy: [14] Greek léthē meant ‘oblivion’ (the Romans used it for the name of a river in Hades whose water induced forgetfulness, and its influence has also been traced in changing Latin lētum ‘death’ to lēthum, source of English lethal [17]). From it was formed the adjective léthargos, which in turn produced the noun lēthargíā, source (via Latin and Old French) of English lethargy.
=> lethal[lethargy etymology, lethargy origin, 英语词源]
Alethea: fem. proper name, from Greek aletheia "truth, truthfulness," from alethes "true," literally "not concealing," from privative prefix a- "not" (see a- (3)) + lethe "forgetfulness, oblivion" (see latent).
amnesia (n.): "loss of memory," 1786 (as a Greek word in English from 1670s), Modern Latin, coined from Greek amnesia "forgetfulness," from a-, privative prefix, "not" (see a- (3)) + stem from mnasthai "to recall, remember," related to mnemnon "mindful," mneme "memory;" from PIE root *men- "to think, remember" (see mind (n.)).
amnestic (adj.): "causing loss of memory," 1879, from Greek amnestia "oblivion, forgetfulness;" see amnesia.
amnesty (n.): "pardon of past offenses," 1570s, from French amnestie "intentional overlooking," from Latin amnestia, from Greek amnestia "forgetfulness (of wrong); an amnesty," from a-, privative prefix, "not" (see a- (3)), + mnestis "remembrance," related to mnaomai "I remember" (see mind (n.)). As a verb, from 1809. Amnesty International founded 1961 as Appeal for Amnesty. The name was changed 1963.
forgetful (adj.): late 14c., from forget + -ful. A curious formation. Used in the sense "causing forgetting" from 1550s, but almost exclusively in poetry (Milton, Tennyson, etc.). An older word in this sense was Middle English forgetel, from Old English forgitel "forgetful," from a formation similar to that in Dutch vergetel. Related: Forgetfully; forgetfulness.
latent (adj.): mid-15c., "concealed, secret," from Latin latentem (nominative latens) "lying hid, secret, unknown," present participle of latere "to lie hidden," from PIE *laidh-, from root *la- "to be hidden" (cognates: Greek lethe "forgetfulness, oblivion," Old Church Slavonic lajati "to lie in wait for"). Meaning "dormant" is from 1680s.
lethal (adj.): 1580s, from Late Latin lethalis, alteration of Latin letalis "deadly, fatal," from letum "death," of uncertain origin. Form altered in Late Latin by association with lethes hydor "water of oblivion" in Hades in Greek mythology, from Greek lethe "forgetfulness."
lethargy (n.): late 14c., litarge, from Old French litargie or directly from Medieval Latin litargia, from Late Latin lethargia, from Greek lethargia "forgetfulness," from lethargos "forgetful," originally "inactive through forgetfulness," from lethe "forgetfulness" (see latent) + argos "idle" (see argon). The form with -th- is from 1590s in English.
Lethe: river of Hades (whose water when drunk caused forgetfulness of the past), from Greek lethe, literally "forgetfulness, oblivion," related to lethargos "forgetful," lathre "secretly, by stealth," lathrios "stealthy," lanthanein "to be hidden." Cognate with Latin latere "to be hidden" (see latent). Related: Lethean.
oblivion (n.): late 14c., "state or fact of forgetting," from Old French oblivion (13c.) and directly from Latin oblivionem (nominative oblivio) "forgetfulness; a being forgotten," from oblivisci (past participle oblitus) "forget," originally "even out, smooth over, efface," from ob "over" (see ob-) + root of levis "smooth," from PIE *lei-w-, from root *(s)lei- "slime, slimy, sticky" (see slime (n.)). Meaning "state of being forgotten" is early 15c.
oblivious (adj.): mid-15c., from Latin obliviosus "forgetful, that easily forgets; producing forgetfulness," from oblivion (see oblivion). Meaning "unaware, unconscious (of something)" is from 1862, formerly regarded as erroneous, this is now the general meaning and the word has lost its original sense of "no longer aware or mindful." Properly should be used with to, not of. Related: Obliviously; obliviousness.
site (n.): "place or position occupied by something," especially with reference to environment, late 14c., from Anglo-French site, Old French site "place, site; position," and directly from Latin situs "a place, position, situation, location, station; idleness, sloth, inactivity; forgetfulness; the effects of neglect," from past participle of sinere "let, leave alone, permit," from PIE *si-tu-, from root *tkei- "to settle, dwell, be home" (see home (n.)).