| sleazy | (adjective) morally degraded | Synonyms: seamy, seedy, sordid, squalid |
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| (adjective) of very poor quality; flimsy | Synonyms: bum, cheap, cheesy, chintzy, crummy, punk, tinny |
| (adjective) of cloth; thin and loosely woven | - |
| sleek | (adjective) having a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk | Synonyms: satiny, silken, silklike, silky, slick |
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| (adjective) well-groomed and neatly tailored; especially too well-groomed | - |
| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: aerodynamic, flowing, streamlined |
| sleeping | (adjective) lying with head on paws as if sleeping | Synonyms: dormant |
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| sleepless | (adjective) always watchful | Synonyms: lidless |
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| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, watchful |
| sleepy | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepyheaded |
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| sleepyheaded | (adjective) ready to fall asleep | Synonyms: sleepy-eyed, sleepy |
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| sleety | (adjective) consisting of or of the nature of frozen or partially frozen rain | - |
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| sleeved | (adjective) made with sleeves or sleeves especially as specified; often used in combination | - |
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| sleeveless | (adjective) having no sleeves | - |
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| (adjective) unproductive of success | Synonyms: bootless, fruitless, futile, vain |
| slender | (adjective) very narrow | Synonyms: thin |
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| (adjective) small in quantity | Synonyms: slim |
| (adjective) having little width in proportion to the length or height | - |
| (adjective) being of delicate or slender build | Synonyms: slight, slim, svelte |