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im·ma·ture(ĭm′ə-tyo͝or′, -cho͝or′, -to͝or′)
1. Not fully grown or developed: an immature plant.
2. Marked by or suggesting a lack of normal maturity: silly, immature behavior. See Synonyms at young.
An immature animal; a juvenile.
im′ma·tur′i·ty, im′ma·ture′ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
adv react, behave → unreif
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007