Here are a few examples of dishonesty in Othello:
1. Iago deceives Othello into believing that Desdemona has been unfaithful with Cassio by fabricating "evidence" and manipulating Othello's insecurities. This ultimately destroys Othello and Desdemona's marriage through jealousy and distrust.
2. Iago lies to Roderigo, telling him he can help Roderigo win Desdemona's love while secretly plotting to steal Roderigo's money and use him as a pawn in his schemes against Cassio and Othello.
3. Iago lies to Cassio, getting him drunk and instigating a fight that leads to Cass