jealous

• adj.嫉妬深い; 疑い深い; 失うことを恐れる; 用心深い.

ラテン語のzelus（情熱的な、熱狂的な）が語源で、語源はzealと同じ。 passionate（情熱的な、熱烈な、競争的な）が語源で、もともとは主に愛や愛情を表すのに使われていたが、envious（うらやましい、嫉妬深い）と卑下され、嫉妬を意味する主な単語になった。

jealous

jealous: [13] Etymologically, jealousy and zeal are two sides of the same coin. Both come ultimately from Greek zelos. This passed into post-classical Latin as zēlus, which later produced the adjective zēlōsus. Old French took this over as gelos or jelous and passed it on to English. The Greek word denoted ‘jealousy’ as well as ‘fervour, enthusiasm’, and it is this strand of meaning that has come down to us in jealous. Jalousie, incidentally, the French equivalent of jealousy, was borrowed into English in the 19th century in the sense ‘blind, shutter’ – the underlying notion apparently being that one can look through the slats without oneself being seen.
=> zeal

jealous (adj.)

c. 1200, gelus, later jelus (early 14c.), "possessive and suspicious," originally in the context of sexuality or romance; in general use late 14c.; also in a more positive sense, "fond, amorous, ardent," from c. 1300, from Old French jalos "keen, zealous; avaricious; jealous" (12c., Modern French jaloux), from Late Latin zelosus, from zelus "zeal," from Greek zelos, sometimes "jealousy," but more often in a good sense ("emulation, rivalry, zeal"). See zeal. In biblical language (early 13c.) "tolerating no unfaithfulness."

Most of the words for 'envy' ... had from the outset a hostile force, based on 'look at' (with malice), 'not love,' etc. Conversely, most of those which became distinctive terms for 'jealousy' were originally used also in a good sense, 'zeal, emulation.' [Buck, pp.1138-9]

Among the ways to express this in other tongues are Swedish svartsjuka, literally "black-sick," from phrase bara svarta strumpor "wear black stockings," also "be jealous." Danish skinsyg "jealous," literally "skin-sick," is from skind "hide, skin" said to be explained by Swedish dialectal expression fa skinn "receive a refusal in courtship."

1. I worked myself into frenzy plotting ways to make him jealous .

私は頭をひねって、彼を嫉妬させるために考えています。

2.Pattie shot Tom in a fit of jealous rage.

パティは嫉妬に燃え、銃撃でトムに当たった。

3.I would be insanely jealous if Bill left me for another woman.

ビルが他の女性のために私を離れたら、私は嫉妬して気が狂ってしまいます。

4.A thought struck her.Was she jealous of her mother，then？

彼女は突然、ある考えを思いついた。では、彼女は母親に嫉妬しているのだろうか。

5.Danny could be very jealous and possessive about me.

ダニーはやきもちが好きで、私の占有欲が強い。