Etymology
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mild (adj.)

Old English milde, of persons, powers, or dispositions, "possessing softness or gentleness, good-tempered, merciful," from Proto-Germanic *milthjaz- (source also of Old Norse mildr (which also contributed to the English word), Old Saxon mildi, Old Frisian milde, Middle Dutch milde, Dutch mild, Old High German milti, German milde "mild," Gothic mildiþa "kindness"), from PIE *meldh-, from root *mel- (1) "soft," which is the source also of Latin mollis "soft."

Of weather, "not rough or stormy," late 14c. Of medicine, etc., "gentle or moderate in force, operation, or effect," c. 1400; of disease from 1744. Of rule, punishment, etc., "moderate in quality or degree, of mitigated force, not hard to endure," by 1570s. It was also used in Old English as an adverb, meaning "mercifully, graciously."

Mild goes further than gentle in expressing softness of nature; it is chiefly a word of nature or character, while gentle is chiefly a word of action. [Century Dictionary]
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mildness (n.)

"state or quality of being mild" in any sense, Old English mildnes "mildness, mercy," from mild (adj.) + -ness.

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mildly (adv.)

"in a mild manner or degree," Middle English mildeli, from Old English mildelice "graciously, affably, kindly;" see mild + -ly (2). Compare Dutch mildlijk, German mildlich, Danish mildelig. Phrase to put it mildly, implying a harsher reality than stated, is attested by 1849.

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aw (interj.)

expression of mild disappointment, sympathy, etc.; recorded in this form by 1888.

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equanimous (adj.)
"of a steady temper," 1650s, from Latin aequanimis "mild, kind" (see equanimity) + -ous.
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la (3)
Anglo-Saxon interjection of mild wonder or surprise, or grief; "oh, ah, indeed, verily."
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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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clement (adj.)

mid-15c., of persons, "mild in temper or disposition" (attested from early 13c. as a surname), from Old French clement, from Latin clementem (nominative clemens) "mild, placid, gentle" (see clemency). Of weather, 1620s. Taken as a name by several early popes and popular in England as a masculine given name from mid-12c., also in fem. form Clemence.

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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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bejesus (interj.)
mild expletive, 1908, probably from by Jesus. Compare bejabbers (by 1821 in representations of Irish dialect), from the same source. To beat the bejesus out of someone is a transferred sense from 1934.
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