Also found in: Thesaurus, Medical.
1. Not interesting; dull: "and there pour forth jejune words and useless empty phrases" (Anthony Trollope).
2. Lacking maturity; childish: surprised by their jejune responses to our problems.
3. Lacking in nutrition: a jejune diet.
[From Latin iēiūnus, meager, dry, fasting.]
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.