קָנָא
From LSJ
Ὅρκον δὲ φεῦγε καὶ δικαίως κἀδίκως (κἂν δικαίως ὀμνύῃς) → Iurare fugias, vere, falso, haud interest → Zu schwören meide, gleich ob richtig oder falsch
English (Strong)
a primitive root; to be (causatively, make) zealous, i.e. (in a bad sense) jealous or envious: (be) envy(-ious), be (move to, provoke to) jealous(-y), X very, (be) zeal(-ous).