| slouch | (noun) a stooping carriage in standing and walking | - |
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| (noun) an incompetent person; usually used in negative constructions | - |
| sloucher | (noun) a person who slouches; someone with a drooping carriage | - |
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| slough | (noun) any outer covering that can be shed or cast off (such as the cast-off skin of a snake) | - |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: gangrene, sphacelus |
| (noun) a stagnant swamp (especially as part of a bayou) | - |
| (noun) a hollow filled with mud | - |
| sloughing | (noun) the process whereby something is shed | Synonyms: shedding |
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| sloven | (noun) a coarse obnoxious person | Synonyms: pig, slob, slovenly person |
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| slovenliness | (noun) habitual uncleanliness | - |
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| (noun) a lack of order and tidiness; not cared for | Synonyms: sloppiness, unkemptness |
| slowcoach | (noun) someone who moves slowly | Synonyms: plodder, slowpoke, stick-in-the-mud |
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| slowdown | (noun) the act of slowing down or falling behind | Synonyms: lag, retardation |
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| slowing | (noun) a decrease in rate of change | Synonyms: deceleration, retardation |
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| slowness | (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberateness, deliberation, unhurriedness |
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| (noun) lack of normal development of intellectual capacities | Synonyms: backwardness, mental retardation, retardation, subnormality |
| (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, clumsiness, ineptitude, ineptness, maladroitness |
| slowpoke | (noun) someone who moves slowly | Synonyms: plodder, slowcoach, stick-in-the-mud |
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| slowworm | (noun) small burrowing legless European lizard with tiny eyes; popularly believed to be blind | Synonyms: Anguis fragilis, blindworm |
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| 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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| slyboots | (noun) a shifty deceptive person | Synonyms: dodger, fox |
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| slyness | (noun) shrewdness as demonstrated by being skilled in deception | Synonyms: craft, craftiness, cunning, foxiness, guile, wiliness |
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| souslik | (noun) rather large central Eurasian ground squirrel | Synonyms: Citellus citellus, suslik |
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| superslasher | (noun) large (20-ft) and swift carnivorous dinosaur having an upright slashing claw 15 inches long on each hind foot; early Cretaceous | Synonyms: utahraptor |
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| suslik | (noun) rather large central Eurasian ground squirrel | Synonyms: Citellus citellus, souslik |
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| teasle | (noun) any of several herbs of the genus Dipsacus native to the Old World having flower heads surrounded by spiny bracts | Synonyms: teasel, teazel |
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| tesla | (noun) a unit of magnetic flux density equal to one weber per square meter | - |
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| translation | (noun) the act of uniform movement | Synonyms: displacement |
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| (noun) the act of changing in form or shape or appearance | Synonyms: transformation |
| (noun) a written communication in a second language having the same meaning as the written communication in a first language | Synonyms: interlingual rendition, rendering, version |
| (noun) rewording something in less technical terminology | - |
| (noun) a uniform movement without rotation | - |
| (noun) (genetics) the process whereby genetic information coded in messenger RNA directs the formation of a specific protein at a ribosome in the cytoplasm | - |
| (noun) (mathematics) a transformation in which the origin of the coordinate system is moved to another position but the direction of each axis remains the same | - |
| translator | (noun) a program that translates one programming language into another | Synonyms: translating program |
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| (noun) someone who mediates between speakers of different languages | Synonyms: interpreter |
| (noun) a person who translates written messages from one language to another | Synonyms: transcriber |
| transliteration | (noun) a transcription from one alphabet to another | - |
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| translocation | (noun) (genetics) an exchange of chromosome parts | - |
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| (noun) the transport of dissolved material within a plant | - |
| translucence | (noun) the quality of allowing light to pass diffusely | Synonyms: semitransparency, translucency |
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| translucency | (noun) the quality of allowing light to pass diffusely | Synonyms: semitransparency, translucence |
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| tussle | (noun) disorderly fighting | Synonyms: dogfight, hassle, rough-and-tumble, scuffle |
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| vizsla | (noun) Hungarian hunting dog resembling the Weimaraner but having a rich deep red coat | Synonyms: Hungarian pointer |
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