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• a  characteristic of a lack of maturity
  immature behavior
• a  (used of living things especially persons) in an early period of life or development or growth
• a  not fully developed or mature; not ripe
• a  not yet mature
• a  (of birds) not yet having developed feathers

• The results challenge the accepted notion that teens make dumb decisions because their brains are immature.
• Some of their opinions: "emotionally unstable," "immature," "cowardly," "grossly psychotic," "paranoid," "mass murderer," "amoral and immoral," "chronic schizophrenic" and .
• Atkinson realizes that Bean's immature antics may not appeal to everyone.

• young
• green
• unripe
• unripened
• unfledged

• mature
• old
• ripe
• fledged

News & Articles

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• Preventing eggs' death from chemotherapy: Scientists discover cause of immature eggs' death from cancer drug and how ...
  Young women who have cancer treatment often lose their fertility because chemotherapy and radiation can damage or kill their immature ovarian eggs, called oocytes. Now, scientists have found the molecular pathway that can prevent the death of immature ovarian eggs due to chemotherapy, potentially preserving fertility and endocrine function. Scientists achieved this in mice by adding a currently ...
  June 18, 2013 - Science Daily
• Music: (@marqueshouston) Marques Houston - Give Your Love a Try
  The Batman of Immature has grown into a confident gentleman with an open mind. Sometimes people run from the best situation because of dismay within their self.
  June 18, 2013 - Singersroom
• NFC West flavor at rookie symposium
  Vernon Davis, Delanie Walker, Patrick Kerney and Aeneas Williams are among the current and former NFC West players called upon to speak at the NFL's annual Rookie Symposium next week. The NFL made the announcement Tuesday. Davis, entering his eighth season with the San Francisco 49ers, was once an immature young player prone to outbursts on the field and during practice. He has grown into a ...
  June 18, 2013 - ESPN Blogs

Quotes

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• Sarah Palin in CNN International
  Those were taken out of context and that's cruel,Palin said. "It's mean-spirited. It's immature. It's unprofessional and those guys are jerks if they came away with it, taking things out of context, and then tried to spread something on...
• John Kosmina in ABC Online
  I actually had a shot at Frank afterwards. The conversation (in the newspaper) didn't happen - Frank lied, end of story,Kosmina said. "We had a chat but not about any of the things he mentioned. It was a fairly immature, very...
• Ben Roethlisberger in USA Today
  I've wanted to apologize to (Steelers fans) for so many things,Roethlisberger told WTAE-TV, "for being immature, for being dumb, for being young. From the bottom of my heart I know I haven't been the best person."