
1) Acting like a kid 2) Adolescent 3) Babyish 4) Characterized by youth 5) Childish 6) Childlike 7) Early in time 8) Immature 9) Infantile 10) Juvenile 11) Like Superboy 12) Little 13) Suggestive of youth 14) Vernal 15) Vigorous and fresh 16) Vigorous; active 17) Young
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https://www.crosswordclues.com/clue/youthful

1) Adolescent 2) Inexperienced 3) Teenage 4) Vernal 5) Yeasty 6) Young
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https://www.crosswordclues.com/clue/youthful
[publisher] Youthful (also known as Youthful Magazines) was an American comic book publisher that operated from 1949–1954. The company was owned by attorney Bill Friedman and his wife Sophie, with Bill holding the title of Publisher. Comics editor Sol Cohen (possibly with help from financier Harry Donenfeld) helped launch Youthful. The co...
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http://en.wikipedia.org/wiki/Youthful_(publisher)

• (a.) Also used figuratively. • (a.) Of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports. • (a.) Not yet mature or aged; young. • (a.) Fresh; vigorous, as in youth.
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http://thinkexist.com/dictionary/meaning/youthful/

1. Not yet mature or aged; young. 'Two youthful knights.' Also used figuratively. 'The youthful season of the year.' ... 2. Of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports. 'Warm, youthful blood.' 'Youthful thoughts.' ... 3. Fresh; vigorous, as in youth. ... Synonym: puerile, juvenile. ... Yout...
Found on
http://www.encyclo.co.uk/local/20973
Youth'ful adjective 1. Not yet mature or aged; young. 'Two
youthful knights.'
Dryden. Also used figuratively. 'The
youthful season of the year.'
Shak. 2. Of or pertaining to the early part of life; suitable to early life; as,
youthful days;
you...Found on
http://www.encyclo.co.uk/webster/Y/7

[
adj] - suggestive of youth
Found on
http://www.webdictionary.co.uk/definition.php?query=youthful

Full of vibrant, volatile, light characteristics. Flavors may not be well integrated, although they may be. Think of a young wine.
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https://www.encyclo.co.uk/local/20123
vernal adjective suggestive of youth; vigorous and fresh; `he is young for his age`
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https://www.encyclo.co.uk/local/20974

characterized by youth; young. · of, pertaining to, or befitting youth: youthful enthusiasm. · having the appearance, freshness, vigor, etc., of youth: She is 60 but her optimism has kept her youthful. · in an early period of existence; early in time. · (of topographical features) having undergone erosion to a slight extent onl...
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https://www.infoplease.com/dictionary/youthful
No exact match found.