youthful
Americanadjective
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characterized by youth; young.
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of, relating to, or befitting youth.
youthful enthusiasm.
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having the appearance, freshness, vigor, etc., of youth.
She is 60 but her optimism has kept her youthful.
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in an early period of existence; early in time.
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Physical Geography. (of topographical features) having undergone erosion to a slight extent only.
adjective
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of, relating to, possessing, or characteristic of youth
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fresh, vigorous, or active
he's surprisingly youthful for his age
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in an early stage of development
a youthful culture
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Also: young. (of a river, valley, or land surface) in the early stage of the cycle of erosion, characterized by steep slopes, lack of flood plains, and V-shaped valleys Compare mature old
Synonym Usage
See young.
Other Word Forms
Etymology
Origin of youthful
Explanation
Use the adjective youthful to describe someone who is young or who acts as though they are — like your surprisingly youthful grandma, who just signed up for a hiphop dance class and rides her skateboard around the neighborhood. This word is handy for talking about the general characteristics of young people, like youthful energy, youthful stubbornness, or youthful enthusiasm. You might also say someone looks youthful if they appear younger than they are. Someone who acts youthful might enjoy swinging on the swings at the playground, even if they're no longer a kid. At the heart of youthful is youth, "the period between childhood and adulthood."
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Angels youthful hitters Nolan Schanuel and Zach Neto were among the top 10 MLB players in challenges, and their success rates were better than league average at 56%.
From Los Angeles Times ● Oct. 7, 2026
Instead of relying on stem cells, existing cartilage cells called chondrocytes changed their patterns of gene activity and shifted toward a more youthful state.
From Science Daily ● Oct. 6, 2026
NOS was a sensation - attracting a youthful congregation of up to 600 people with an innovative blend of cutting-edge music, video, prayer, and dancing.
From BBC ● Oct. 3, 2026
“Another thing about emphasizing the efficacy of youthful endeavor in changing the world is the riff of the song was written by Roman,” Morello explained.
From Salon ● Sep. 22, 2026
To the unabashedly chauvinistic Time, the youthful Professor Lawrence’s career symbolized the emergence of American science as the lodestar of international research.
From "Big Science" by Michael Hiltzik
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
