| slub | (noun) soft lump or unevenness in a yarn; either an imperfection or created by design | Synonyms: burl, knot |
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| sludge | (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, gunk, muck, ooze, slime |
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| (noun) the precipitate produced by sewage treatment | - |
| slug | (noun) (boxing) a blow with the fist | Synonyms: biff, clout, lick, poke, punch |
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| (noun) any of various terrestrial gastropods having an elongated slimy body and no external shell | - |
| (noun) a projectile that is fired from a gun | Synonyms: bullet |
| (noun) a strip of type metal used for spacing | Synonyms: type slug |
| (noun) an amount of an alcoholic drink (usually liquor) that is poured or gulped | - |
| (noun) an idle slothful person | Synonyms: sluggard |
| (noun) a counterfeit coin | - |
| (noun) a unit of mass equal to the mass that accelerates at 1 foot/sec/sec when acted upon by a force of 1 pound; approximately 14.5939 kilograms | - |
| slugabed | (noun) a person who stays in bed until a relatively late hour | Synonyms: lie-abed |
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| slugfest | (noun) a fight with bare fists | Synonyms: fistfight, fisticuffs |
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| sluggard | (noun) an idle slothful person | Synonyms: slug |
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| slugger | (noun) (baseball) a ballplayer who is batting | Synonyms: batsman, batter, hitter |
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| (noun) a boxer noted for an ability to deliver hard punches | Synonyms: slogger |
| sluggishness | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, languor, lethargy, phlegm |
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| (noun) the pace of things that move relatively slowly | - |
| (noun) a state of comatose torpor (as found in sleeping sickness) | Synonyms: lassitude, lethargy |
| sluice | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: penstock, sluiceway |
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| sluicegate | (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: floodgate, head gate, penstock, sluice valve, water gate |
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| sluiceway | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: penstock, sluice |
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| slum | (noun) a district of a city marked by poverty and inferior living conditions | Synonyms: slum area |
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| slumber | (noun) a dormant or quiescent state | - |
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| (noun) a natural and periodic state of rest during which consciousness of the world is suspended | Synonyms: sleep |
| slumberer | (noun) a rester who is sleeping | Synonyms: sleeper |
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| slumgullion | (noun) a thin stew of meat and vegetables | - |
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| slump | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slack |
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| (noun) a long-term economic state characterized by unemployment and low prices and low levels of trade and investment | Synonyms: depression, economic crisis |
| slumpflation | (noun) a situation in which economic depression is combined with increasing inflation. | - |
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| slur | (noun) a blemish made by dirt | Synonyms: blot, daub, smear, smirch, smudge, spot |
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| (noun) a disparaging remark | Synonyms: aspersion |
| (noun) (music) a curved line spanning notes that are to be played legato | - |
| slurry | (noun) a suspension of insoluble particles (as plaster of Paris or lime or clay etc.) usually in water | - |
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| slush | (noun) partially melted snow | - |
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| slut | (noun) a woman adulterer | Synonyms: adulteress, fornicatress, hussy, jade, loose woman, strumpet, trollop |
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| (noun) a dirty untidy woman | Synonyms: slattern, slovenly woman, trollop |
| (noun) A sexually loose woman | Synonyms: ho, hoe, hussy, trollop |
| sluttishness | (noun) in the manner of a slattern | Synonyms: slatternliness |
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