sunder (v.)

"into a position apart, separate, into separate parts," mid-12c., a contraction of Old English on sundran (see a- (1) + sunder). Middle English used to know asunder for "distinguish, tell apart."

c. 1300, sauns, saun, "without" (mid-12c. in surnames), from Old French san, sans, sen, senz (some of the forms with adverbial genitive -s) "without, except, apart, not counting." This is cognate with Provençal senes, Old Catalan senes, Old Spanish sen (Spanish sin), Old Italian sen, all from Vulgar Latin *sene, from Latin sine "without," an enlarged form of sed, se "without" (from PIE root *sen(e)- "apart, separated;" see sunder).

"A French word which has existed long in English without becoming naturalized; now archaic or affected, except as used in heraldry ..." [Century Dictionary, 1891]; OED writes that the words limited modern use is "chiefly with reminiscence of Shakespere," which it spells that way. In reference to fonts, by 1927, short for sans-serif. Sans souci, French, as an adverbial phrase "free from care, without care or concern," was the name of Frederick the Great's royal palace at Potsdam. 

Middle English sondri, from Old English syndrig "separate, apart, special, distinct, characteristic," all now obsolete or dialectal; from sundor "separately, apart, asunder" (see sunder) + -y (2). Compare Old High German suntaric, Swedish söndrig "broken, tattered." The meaning "several, various" is attested from late 14c.

As a noun, from mid-13c. with the sense "various ones." Phrase all and sundry "every one of all classes" is from late 14c.