whippersnapper

/ˈwɪpərˌsnæpər/
noun
  1. A young person who is considered too confident, disrespectful, or inexperienced, especially by an older person.
    • Some whippersnapper in a sports car cut me off on the highway this morning.
    • My grandfather grumbles about 'whippersnappers' who don't know how to write in cursive.
    • The old man called the new intern a whippersnapper for questioning his methods.
Antonyms