Synonym: callow, childish, fresh, juvenile, young. Antonym: aged, grown-up. Similar words: truthful, truthfulness, slothful, faithful, faithfully, unfaithful, wishful, bashful. Meaning: [juːθfʊl] 
adj. suggestive of youth; vigorous and fresh.
adj. suggestive of youth; vigorous and fresh. 
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1, I have a youthful spirit.
2, She has managed to maintain her youthful appearance.
3, He has given up youthful follies.
4, They set about their work with youthful vigour and enthusiasm.
5, If you want to retain youthful vigor,you have to take regular exercise.
6, The experience of our side and the youthful determination of the other balance each other out.
7, We can excuse his behaviour as youthful exuberance.
8, I put her remarks down to youthful ebullience.
9, She's 73, but hasn't lost that youthful, springy step.
10, I admired his youthful insouciance.
11, He was full of youthful idealism.
12, The skin loses its youthful bloom.
13, We should forgive him a few youthful indiscretions.
14, She has very youthful skin.
15, Clinton's youthful image made him an extremely electable candidate.
16, She's a very youthful sixty-five.
17, His youthful escapades came back to haunt him.
18, The boy looked very youthful.
19, The photo shows a smiling,[http://sentencedict.com/youthful.html] youthful Burgos.
20, He still had a youthful look about him.
21, At the time I admired his youthful enthusiasm.
22, Exercise will keep you youthful.
23, He brought youthful energy, dash and charisma to the department.
24, Her energy and youthful good looks belie her 65 years.
25, With their new youthful and telegenic leader, the Labour party looks set to woo the voters.
26, A youthful teacher, he finds himself an unwilling participant in school politics.
27, The youthful learners who desired to perfect their education studied hard.
28, A youthful president can be good for a country's morale.
29, This cream claims to restore your skin to its youthful condition.
30, Earl describes his past links with the racist group as a youthful indiscretion .
More similar words: truthful, truthfulness, slothful, faithful, faithfully, unfaithful, wishful, bashful, watchful, reproachful, watchfulness, youth, south, mouth, truth, southern, uncouth, sleuth, author, untruth, in truth, southeast, mouthing, ruthless, authentic, south pole, southwest, hand to mouth, mouthpiece, authorize.