preconceived idea

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an opinion formed beforehand without adequate evidence
- he did not even try to confirm his preconceptions
• Syn:
preconception, prepossession, parti pris, preconceived opinion, preconceived notion
• Derivationally related forms:
prepossess (for: prepossession), preconceive (for: preconception)
• Hypernyms:
opinion, sentiment, persuasion, view, thought