patronising

showing that you think someone is less intelligent, less capable, or less important than you — for example, by explaining simple things too slowly, using a tone of voice you would use with a child, or giving praise that sounds fake.

• condescending

  the closest synonym; slightly more formal, both describe looking down on someone

• superior

  focuses on the attitude of feeling above others but may not involve the dismissive treatment

• dismissive

  emphasises rejecting or ignoring someone's views rather than talking down to them

• snobbish

  focuses on social class or taste rather than intelligence

• respectful

  showing genuine regard for someone's abilities and feelings

• humble

  not showing a sense of superiority; modest about one's own importance