emulation, envy(-ing), fervent mind, indignation, jealousy, zeal

“22. Envy. Zeal. Emulation. Jealousy” From Concise Bible Dictionary:

Both ζῆλος and φθόνος are translated 'envy,' but they are not used indiscriminately. Ζῆλος is sometimes used in a good and sometimes in a bad sense, whereas φθόνος is perhaps always used in a bad sense in the New Testament.
Above it is said, ‘perhaps' φθόνος always has a bad sense in the N. T. because of Jas. 4:55Do ye think that the scripture saith in vain, The spirit that dwelleth in us lusteth to envy? (James 4:5). This is a difficult passage, and has been variously translated. Apparently the A. V. and R. V. assume the ‘spirit' to be the human spirit, which naturally lusteth to envy; but others believe the spirit to be the Holy Spirit, and if so, may not the sense be, as given by Bengel, "Does the Spirit, which has taken up his dwelling in us, lust enviously?" This latter interpretation is in all probability the right one.

“Jealousy (Qana)” From Concise Bible Dictionary:

“To be inflamed.” The warm affection that cannot bear to see its loved one enticed by another, as a man is jealous of his wife (Num. 5:1414And the spirit of jealousy come upon him, and he be jealous of his wife, and she be defiled: or if the spirit of jealousy come upon him, and he be jealous of his wife, and she be not defiled: (Numbers 5:14)); as Paul felt for the Corinthian saints (2 Cor. 11:22For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a chaste virgin to Christ. (2 Corinthians 11:2)); and as God regarded the people and the land which He had chosen, and upon which He had placed His name (Psa. 39:55Behold, thou hast made my days as an handbreadth; and mine age is as nothing before thee: verily every man at his best state is altogether vanity. Selah. (Psalm 39:5); Ezek. 39:2525Therefore thus saith the Lord God; Now will I bring again the captivity of Jacob, and have mercy upon the whole house of Israel, and will be jealous for my holy name; (Ezekiel 39:25); Joel 2:1818Then will the Lord be jealous for his land, and pity his people. (Joel 2:18); Zech. 1:1414So the angel that communed with me said unto me, Cry thou, saying, Thus saith the Lord of hosts; I am jealous for Jerusalem and for Zion with a great jealousy. (Zechariah 1:14); Zech. 8:22Thus saith the Lord of hosts; I was jealous for Zion with great jealousy, and I was jealous for her with great fury. (Zechariah 8:2)). “Jehovah, whose name is jealous, is a jealous God” (Ex. 34:1414For thou shalt worship no other god: for the Lord, whose name is Jealous, is a jealous God: (Exodus 34:14)).
THE LAW OF JEALOUSY, when a man suspected his wife of being unfaithful to him, is given in Numbers 5:11-3111And the Lord spake unto Moses, saying, 12Speak unto the children of Israel, and say unto them, If any man's wife go aside, and commit a trespass against him, 13And a man lie with her carnally, and it be hid from the eyes of her husband, and be kept close, and she be defiled, and there be no witness against her, neither she be taken with the manner; 14And the spirit of jealousy come upon him, and he be jealous of his wife, and she be defiled: or if the spirit of jealousy come upon him, and he be jealous of his wife, and she be not defiled: 15Then shall the man bring his wife unto the priest, and he shall bring her offering for her, the tenth part of an ephah of barley meal; he shall pour no oil upon it, nor put frankincense thereon; for it is an offering of jealousy, an offering of memorial, bringing iniquity to remembrance. 16And the priest shall bring her near, and set her before the Lord: 17And the priest shall take holy water in an earthen vessel; and of the dust that is in the floor of the tabernacle the priest shall take, and put it into the water: 18And the priest shall set the woman before the Lord, and uncover the woman's head, and put the offering of memorial in her hands, which is the jealousy offering: and the priest shall have in his hand the bitter water that causeth the curse: 19And the priest shall charge her by an oath, and say unto the woman, If no man have lain with thee, and if thou hast not gone aside to uncleanness with another instead of thy husband, be thou free from this bitter water that causeth the curse: 20But if thou hast gone aside to another instead of thy husband, and if thou be defiled, and some man have lain with thee beside thine husband: 21Then the priest shall charge the woman with an oath of cursing, and the priest shall say unto the woman, The Lord make thee a curse and an oath among thy people, when the Lord doth make thy thigh to rot, and thy belly to swell; 22And this water that causeth the curse shall go into thy bowels, to make thy belly to swell, and thy thigh to rot: And the woman shall say, Amen, amen. 23And the priest shall write these curses in a book, and he shall blot them out with the bitter water: 24And he shall cause the woman to drink the bitter water that causeth the curse: and the water that causeth the curse shall enter into her, and become bitter. 25Then the priest shall take the jealousy offering out of the woman's hand, and shall wave the offering before the Lord, and offer it upon the altar: 26And the priest shall take an handful of the offering, even the memorial thereof, and burn it upon the altar, and afterward shall cause the woman to drink the water. 27And when he hath made her to drink the water, then it shall come to pass, that, if she be defiled, and have done trespass against her husband, that the water that causeth the curse shall enter into her, and become bitter, and her belly shall swell, and her thigh shall rot: and the woman shall be a curse among her people. 28And if the woman be not defiled, but be clean; then she shall be free, and shall conceive seed. 29This is the law of jealousies, when a wife goeth aside to another instead of her husband, and is defiled; 30Or when the spirit of jealousy cometh upon him, and he be jealous over his wife, and shall set the woman before the Lord, and the priest shall execute upon her all this law. 31Then shall the man be guiltless from iniquity, and this woman shall bear her iniquity. (Numbers 5:11‑31). The woman was required to drink bitter water, composed of “holy water,” in which was placed dust from the floor of the tabernacle (type of the Holy Spirit applying what death is, as God’s judgment of sin, by the word to the conscience). If she had been unfaithful it would be a curse to her. It pointed figuratively to the question of Israel’s unfaithfulness to Jehovah.

Strong’s Dictionary of Greek Words:

Greek:
ζῆλος
Transliteration:
zelos
Phonic:
dzay’-los
Meaning:
from 2204; properly, heat, i.e. (figuratively) "zeal" (in a favorable sense, ardor; in an unfavorable one, jealousy, as of a husband (figuratively, of God), or an enemy, malice)
KJV Usage:
emulation, envy(-ing), fervent mind, indignation, jealousy, zeal