Etymology
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supple (adj.)
c. 1300, "soft, tender," from Old French souple, sople "pliant, flexible; humble, submissive" (12c.), from Gallo-Roman *supples, from Latin supplex "submissive, humbly begging, beseeching, kneeling in entreaty, suppliant," literally "bending, kneeling down," perhaps an altered form of *supplacos "humbly pleading, appeasing," from sub "under" (see sub-) + placare "to calm, appease, quiet, soothe, assuage," causative of placere "to please" (see please, and compare supplication).

Meaning "pliant" is from late 14c.; figurative sense of "artfully obsequious, capable of adapting oneself to the wishes and opinions of others" is from c. 1600. Supple-chapped (c. 1600) was used of a flatterer. Related: Suppleness.
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lenient (adj.)

1650s, "relaxing, soothing" (a sense now archaic), from French lenient, from Latin lenientem (nominative leniens), present participle of lenire "to soften, alleviate, allay; calm, soothe, pacify," from lenis "mild, gentle, calm," which probably is from a suffixed form of PIE root *‌‌lē- "to let go, slacken."

The usual modern sense of "mild, merciful" (of persons or actions) is first recorded 1787. In earlier use was lenitive, attested from early 15c. of medicines, 1610s of persons. Related: Leniently.

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composed (adj.)

"calm, tranquil, free from disturbance or agitation," c. 1600, past-participle adjective from compose (v.). Earlier (1560s) "made up of parts." Related: Composedly; composedness.

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quiesce (v.)

"become quiet or calm, become silent," 1821, from Latin quiescere "to rest," from suffixed form of PIE root *kweie- "to rest, be quiet."

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Quietism (n.)

a form of mysticism which consists in abnegation of all exercise of the will and purely passive meditation on God and divine things, 1680s, from Italian quietismo, literally "passiveness," from quieto "calm, at rest," from Latin quietus "free; calm, resting" (from PIE root *kweie- "to rest, be quiet").

Originally in reference to the mysticism of Miguel Molinos (1640-1697), Spanish priest in Rome, whose "Guida spirituale" was published 1675 and condemned by the Inquisition in 1685. Related: Quietist; Quietistic.

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halcyon (adj.)
"calm, quiet, peaceful," 1540s, in halcyon dayes (translating Latin alcyonei dies, Greek alkyonides hemerai), 14 days of calm weather at the winter solstice, when a mythical bird (also identified with the kingfisher) was said to breed in a nest floating on calm seas. The name of this fabulous bird is attested in Middle English as alcioun (late 14c.).

The name is from Latin halcyon, alcyon, from Greek halkyon, variant (perhaps a misspelling) of alkyon "kingfisher," a word of unknown origin. The explanation that this is from hals "sea; salt" (see halo-) + kyon "conceiving," present participle of kyein "to conceive," literally "to swell" (see cumulus) probably is ancient folk-etymology to explain a loan-word from a non-Indo-European language. Identified in mythology with Halcyone, daughter of Aeolus, who when widowed threw herself into the sea and became a kingfisher.
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downy (adj.)

"covered with down; resembling down," 1570s, from down (n.1) + -y (2). Related: Downiness.

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duvet (n.)

"quilt or comforter stuffed with down," 1758, from French duvet "down," earlier dumet, diminutive of dum "down."

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serene (adj.)

mid-15c., of a day, "clear, fair, calm," from Old French serein and directly from Latin serenus "peaceful, calm, clear, unclouded" (of weather); figuratively "cheerful, glad, tranquil"(from PIE root *ksero- "dry," source also of Greek xeros "dry, arid;" see xerasia).

In English, the word has been applied to persons, characters, etc. since 1630s: "tranquil, unruffled." Related: Serenely. Middle English also had serenous (mid-15c.), of places, "having clear, fair weather."

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lithe (adj.)
Old English liðe "soft, mild, gentle, calm, meek," also, of persons, "gracious, kind, agreeable," from Proto-Germanic *linthja- (source also of Old Saxon lithi "soft, mild, gentle," Old High German lindi, German lind, Old Norse linr "soft to the touch, gentle, mild, agreeable," with characteristic loss of "n" before "th" in English), from PIE root *lento- "flexible" (source also of Latin lentus "flexible, pliant, slow," Sanskrit lithi).

In Middle English, used of the weather. Current sense of "easily flexible" is from c. 1300. Related: Litheness. Old and Middle English had the related verb lin "to cease doing (something)," also used of the wind dying down.
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