| slack | (adjective) not tense or taut | Synonyms: loose |
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| (adjective) lacking in rigor or strictness | Synonyms: lax |
| (adjective) flowing with little speed as e.g. at the turning of the tide | - |
| slain | (adjective) killed; `slain' is formal or literary as in "slain warriors" | - |
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| slaked | (adjective) allayed | Synonyms: quenched, satisfied |
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| slanderous | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, denigratory, libellous, libelous |
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| slangy | (adjective) constituting or expressed in slang or given to the use of slang | - |
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| slanted | (adjective) having an oblique or slanted direction | Synonyms: aslant, aslope, diagonal, slanting, sloped, sloping |
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| (adjective) favoring one person or side over another | Synonyms: biased, colored, coloured, one-sided |
| slanting | (adjective) having an oblique or slanted direction | Synonyms: aslant, aslope, diagonal, slanted, sloped, sloping |
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| slapdash | (adjective) marked by great carelessness | Synonyms: haphazard, slipshod, sloppy |
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| slaphappy | (adjective) dazed from or as if from repeated blows | Synonyms: punch-drunk, silly |
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| (adjective) cheerfully irresponsible | Synonyms: carefree, devil-may-care, freewheeling, happy-go-lucky, harum-scarum |
| slapstick | (adjective) characterized by horseplay and physical action | - |
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| slashed | (adjective) having long and narrow ornamental cuts showing an underlying fabric | - |
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| (adjective) (used of rates or prices) reduced usually sharply | Synonyms: cut |
| (adjective) patterned by having color applied with sweeping strokes | - |
| slashing | (adjective) as if striking with slashing blows | - |
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| slatey | (adjective) of the color of slate or granite | Synonyms: slate-gray, slate-grey, slaty-gray, slaty-grey, slaty, stone-gray, stone-grey |
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| slatternly | (adjective) characteristic of or befitting a slut or slattern; used especially of women | Synonyms: blowsy, blowzy, sluttish |
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| slaty | (adjective) of the color of slate or granite | Synonyms: slate-gray, slate-grey, slatey, slaty-gray, slaty-grey, stone-gray, stone-grey |
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| slaughterous | (adjective) accompanied by bloodshed | Synonyms: butcherly, gory, sanguinary, sanguineous |
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| slaveholding | (adjective) allowing slavery | - |
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| slaveless | (adjective) where slavery was prohibited | Synonyms: free-soil, non-slave |
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| slavelike | (adjective) suitable for a slave or servant | - |
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| slavish | (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: submissive, subservient |
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| (adjective) blindly imitative | - |