"To give a settled and often prejudiced outlook to" (Merriam Webster)
Logical fallacies:
"Fallacies are common errors in reasoning that will undermine the logic of your argument. Fallacies can be either illegitimate arguments or irrelevant points, and are often identified because they lack evidence that supports their claim." (Purdue University)
Click through these slides to see some examples of biases and logical fallacies.
Have you seen some of these in news reports, or heard them from family or friends?