| sulla | (noun) perennial of southern Europe cultivated for forage and for its nectar-rich pink flowers that make it an important honey crop | Synonyms: French honeysuckle, Hedysarum coronarium |
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| sullen | (adjective) darkened by clouds | Synonyms: heavy, lowering, threatening |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, saturnine, sour |
| sullenly | (adverb) in a sullen manner | Synonyms: dourly, glumly |
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| sullenness | (noun) a sullen moody resentful disposition | Synonyms: moroseness, sourness, sulkiness |
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| (noun) a gloomy ill-tempered feeling | Synonyms: glumness, moroseness |
| sully | (verb) charge falsely or with malicious intent; attack the good name and reputation of someone | Synonyms: asperse, besmirch, calumniate, defame, denigrate, slander, smear, smirch |
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| (verb) make dirty or spotty, as by exposure to air; also used metaphorically | Synonyms: defile, maculate, stain, tarnish |
| (verb) place under suspicion or cast doubt upon | Synonyms: cloud, corrupt, defile, taint |