This line reveals that Banquo suspects Macbeth of playing a dirty game to achieve his ambitions. Banquo believes that Macbeth may have resorted to foul play, such as cheating or deceit, in order to gain power and fulfill his desires.
He played "Foully"
he served loyal to Duncan in many battles and act 1 scene 2 he has killed Macdonwald and conquered the armies of the king of Norway and the scottish traitor the thane of Cawdor
That his crown will not go to his decedents, but instead will give his crown to Banquo's sons and grandsons. Banquo decides to go to the ceremonial banquet.
Yes, Banquo suspects Macbeth in Act 3 Scene 1. He meets with Macbeth in a room of the royal palace at Forres. It's after Macbeth's coronation at Scone. Banquo comments on the truth of the three witches' three predictions for Macbeth: the thaneship of Glamis and Cawdor, and the kingship of Scotland. He concludes, '...and I fear/Thou played'st most foully for 't' [Lines 2-3].
Foully blemished
The general opinion is that his sons Malcolm and Donalbain had hired his grooms to kill their father. This was supposedly proven because they took off after the murder was discovered, a sign of guilt. This is explained by Macduff in Act II Scene 4.
Macbeth wants Banquo dead because Banquo witnessed what the three witches said. The three witches stated that Macbeth would one day become king. Now that Macbeth has become king, and done so by taking the life of the previous King Duncan, he fears that Banquo will spread the word that Macbeth was the one to commit the murder.
He means he's sceptical of Macbeth's rise to power and starts to doubt that Macbeth acted righteously for the position of king, despite the witches' prophecy saying he would be king. It also shows his uncertainty in the witches as he doesn't have full trust in their prophecies
No, it is not an adverb.the word foul can be a noun, or an adjective. There is an adverb form, foully.
At various times in the play various lords show their mistrust and suspicion for Macbeth. Macduff shows it when he refuses to attend Macbeth's coronation at the end of Act II. Banquo starts Act three by saying "I fear thou play'dst most foully for't". In Act III Scene 6 Lennox expresses his suspicions of Macbeth. Ross arrives in England in Act IV Scene 3 to deliver a message as usual, but it is clear that he will not return to Scotland.
"Thou hast it now: king, Cawdor, Glamis, allAs the weird women promised. And I fearThou playedst most foully for it. Yet it was saidIt should not stand in thy posterity,But that myself should be the root and fatherOf many kings. If there come truth from them(As upon thee, Macbeth, thy speeches shine),Why, by the verities on thee made goodMay they not be my oracles as wellAnd set me up in hope?"
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