Exhibiting great immaturity and lack of judgment: sophomoric behavior. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sophomoric" in a sentence
"To call the musical -- praised on its way to Broadway's Bernard B. Jacobs Theatre and additional kudos -- "sophomoric" is to flatter it."
"To call Bloody Bloody Andrew Jackson sophomoric is to flatter it."
"South Carolina's governor is not confessing his "sins"; he's simply indulging himself in sophomoric, locker room bragging about his sexual exploits."