'Idea' in the Bible

And Jonadab, the son of Shimeah, David's brother, said, Let not my lord have the idea that all the sons of the king have been put to death; for only Amnon is dead: this has been purposed by Absalom from the day when he took his sister Tamar by force.

So now, let not my lord the king take this thing to heart, with the idea that all the king's sons are dead: for only Amnon is dead.

Even though this plan seemed like a good idea to Absalom and to all of the elders of Israel,

And Hushai said to Absalom, Ahithophel's idea is not a good one at this time.