Of, relating to, or suggesting youth. See Synonyms at young.(adjective)
In an early stage of development; new.(adjective)
Geology Young: a youthful streambed. (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 "youthful" in a sentence
"And I spoke with so much animation that Uncle Max smiled at what he called my youthful enthusiasm."
"It is a solitary remnant of what you call my youthful prejudices which inspires me with angry thoughts at the sight of any atrocious act."
"He said he sees no connection between the fires and the incident, which he characterized as youthful mischief."