presumptuous russian

• зано́счивый

  arrogant, insolent, presumptuous, overbearing, haughty

• самонаде́янный

  self-sufficient, presumptuous, presuming

• зарва́вшийся

  presumptuous, high-handed

• самонаде́янно

  conceitedly, presumptuously, perkily

Examples

• Не будь самонаде́ян.Don't be presumptuous.