Preconceived ideas are concepts that have been formed prior to one's experience and result in a biased perception of reality. Synonyms for this term include predetermined notions, fixed beliefs, established opinions, preexisting assumptions, and ingrained ideologies. These words describe a mental framework that shapes one's understanding of the world and influences their behavior and actions. Other synonyms include preconceptions, pre-judgments, and bias, all of which imply a closed-mindedness towards alternative perspectives and an unwillingness to consider new information. Removing preconceived ideas can be a challenge, but doing so is important to ensure a more open and objective approach to learning and decision-making.