| eighteen | (adjective) being one more than seventeen | Synonyms: 18, xviii |
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| evergreen | (adjective) (of plants and shrubs) bearing foliage throughout the year | - |
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| fifteen | (adjective) being one more than fourteen | Synonyms: 15, xv |
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| fourteen | (adjective) being one more than thirteen | Synonyms: 14, xiv |
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| green | (adjective) not fully developed or mature; not ripe | Synonyms: immature, unripe, unripened |
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| (adjective) concerned with or supporting or in conformity with the political principles of the Green Party | - |
| (adjective) of the color between blue and yellow in the color spectrum; similar to the color of fresh grass | Synonyms: dark-green, greenish, light-green |
| (adjective) looking pale and unhealthy | - |
| (adjective) naive and easily deceived or tricked | Synonyms: fleeceable, gullible |
| keen | (adjective) excellent | Synonyms: bang-up, bully, corking, cracking, dandy, great, groovy, neat, nifty, not bad, old, peachy, slap-up, smashing, swell |
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| (adjective) intense or sharp | Synonyms: exquisite |
| (adjective) having or demonstrating ability to recognize or draw fine distinctions | Synonyms: acute, discriminating, incisive, knifelike, penetrating, penetrative, piercing, sharp |
| (adjective) having a sharp cutting edge or point | - |
| (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, knifelike, lancinate, lancinating, piercing, stabbing |
| lateen | (adjective) rigged with a triangular (lateen) sail | Synonyms: lateen-rigged |
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| nineteen | (adjective) being one more than eighteen | Synonyms: 19, xix |
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| preteen | (adjective) of or relating to or designed for children between the ages of 9 and 12 | Synonyms: preadolescent |
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| seventeen | (adjective) being one more than sixteen | Synonyms: 17, xvii |
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| sixteen | (adjective) being one more than fifteen | Synonyms: 16, xvi |
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| teen | (adjective) being of the age 13 through 19 | Synonyms: adolescent, teenage, teenaged |
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| thirteen | (adjective) being one more than twelve | Synonyms: 13, xiii |
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| umpteen | (adjective) innumerable but many | Synonyms: umteen |
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| umteen | (adjective) innumerable but many | Synonyms: umpteen |
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| unforeseen | (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unlooked-for, unseen |
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| unseen | (adjective) not seen or perceived | - |
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| (adjective) not anticipated | Synonyms: out of the blue, unanticipated, unforeseen, unlooked-for |
| (adjective) unnoticed | Synonyms: unobserved |