adj.
- Not fully grown or developed. See synonyms at young.
- Marked by or suggesting a lack of normal maturity: silly, immature behavior.
[Latin immātūrus : in-, not; see in-1 + mātūrus, mature.]
immaturely im'ma·ture'ly adv.immaturity im'ma·tur'i·ty or im'ma·ture'ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
