Similar words: truthfulness, faithfulness, slothfulness, unfaithfulness, bashfulness, watchfulness, awfulness, usefulness. Meaning: [juːθfʊlnɪs] 
n. the freshness and vitality characteristic of a young person.
n. the freshness and vitality characteristic of a young person. 
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1 I wonder at her perennial youthfulness.
2 Rachel allowed herself a brief smile at such youthfulness.
3 Lorne wanted reassurance about his youthfulness, athleticism and general popularity.
4 It shows every sign of youthfulness and intense feeling, but absolutely no sign of technical immaturity.
5 His youthfulness was as striking as hers.
6 Youthfulness is a matter of attitude to life, not of the year of birth.
7 Its campus is beautiful and filled with youthfulness and vitality.
8 Her look of youthfulness made her seem neither hard nor dull, but only primitive and pure.
9 Much was made at the time of the Prince's engagement of the youthfulness and consequent innocence of his bride.
10 Smoothly synchronised endocrine function, an intrinsic factor in determining youthfulness, is also notoriously liable to become unbalanced through stress.
11 I must say again that I heartily admire your gallantry and youthfulness.
12 May the elders have happiness, and with more age have more youthfulness.
13 Take time to play, it is the foundation of youthfulness.
14 It would never do to appear sedate and elderly before Melanie's sweet youthfulness.
15 White roses: unity, loyalty, reverence, humility, sincerity, purity,(www.Sentencedict.com) silence and innocence as well as youthfulness.
16 This style of pajamas for women gives people a feeling of gorgeousness, sexiness and youthfulness.
17 After one month, wrinkles are visibly reduced, the skin looks plumper. and your eyes sparkle with new youthfulness .
18 His flesh was gray, and he was losing his youthfulness.
More similar words: truthfulness, faithfulness, slothfulness, unfaithfulness, bashfulness, watchfulness, awfulness, usefulness, successfulness, joyfulness, carefulness, lawfulness, sinfulness, restfulness, painfulness, hopefulness, mindfulness, hatefulness, willfulness, wistfulness, wakefulness, helpfulness, forgetfulness, playfulness, fearfulness, forcefulness, harmfulness, wastefulness, youthful, boastfulness.