Level 5 · word 8,728 of 20,000

immature

/ˌɪməˈtjʊr/ American
  • adj. 不成熟的, 幼稚的
Definition
  • adj. not fully grown or developed, or behaving in a childish way
Example
His immature behavior surprised everyone at the meeting.
他幼稚的举动让在场所有人都感到吃惊。