Also see definition of "Extinct" in Word Study
Extinct
EXTINCT [isbe]
EXTINCT - eks-tinkt': In Job 17:1, "My days are extinct" (za`akh (in Niphal)) and in Isa 43:17, "They are extinct" (da`akh), the word "extinct" should be recognized as a form of the participle, equivalent to "extinguished," so that in both passages an action, not merely a state, is indicated.
Also see definition of "Extinct" in Word Study
