'Poisonous' in the Bible

Why are we sitting still [the people wonder]?Assemble yourselves, and let us enter the fortified citiesAnd let us die there,For the Lord our God has decreed our ruinAnd given us bitter and poisonous water to drink,Because we have sinned against the Lord.

therefore thus says the Lord of hosts, the God of Israel, “behold, I will feed them, this people, with wormwood and give them bitter and poisonous water to drink.

Therefore thus says the Lord of hosts in regard to the prophets,‘Behold, I am going to feed them [the bitterness of] wormwoodAnd make them drink the poisonous water [of gall],For from the [counterfeit] prophets of JerusalemProfaneness and ungodliness have spread into all the land.’”