| sybaritic | (adjective) displaying luxury and furnishing gratification to the senses | Synonyms: epicurean, luxuriant, luxurious, voluptuary, voluptuous |
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| sycophantic | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, obsequious, toadyish |
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| (adjective) attempting to win favor by flattery | Synonyms: bootlicking, fawning, toadyish |
| syllabic | (adjective) consisting of a syllable or syllables | - |
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| (adjective) (of verse) having lines based on number of syllables rather than on rhythmical arrangement of stresses or quantities | - |
| (adjective) (of speech sounds) forming the nucleus of a syllable | - |
| (adjective) consisting of or using a syllabary | - |
| (adjective) of or relating to syllables | - |
| syllabled | (adjective) pronounced in syllables | - |
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| syllogistic | (adjective) of or relating to or consisting of syllogism | - |
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| sylphic | (adjective) (of a woman or girl) slender and graceful like a sylph | Synonyms: sylphlike |
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| sylphlike | (adjective) (of a woman or girl) slender and graceful like a sylph | Synonyms: sylphic |
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| sylvan | (adjective) relating to or characteristic of wooded regions | Synonyms: silvan |
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| symbiotic | (adjective) used of organisms (especially of different species) living together but not necessarily in a relation beneficial to each | - |
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| symbolic | (adjective) relating to or using or proceeding by means of symbols | Synonyms: symbolical |
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| (adjective) using symbolism | - |
| (adjective) serving as a visible symbol for something abstract | Synonyms: emblematic, emblematical, symbolical |
| symbolical | (adjective) relating to or using or proceeding by means of symbols | Synonyms: symbolic |
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| (adjective) serving as a visible symbol for something abstract | Synonyms: emblematic, emblematical, symbolic |
| symmetric | (adjective) having similarity in size, shape, and relative position of corresponding parts | Synonyms: symmetrical |
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| symmetrical | (adjective) having similarity in size, shape, and relative position of corresponding parts | Synonyms: symmetric |
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| (adjective) exhibiting equivalence or correspondence among constituents of an entity or between different entities | Synonyms: harmonious, proportionate |
| sympathetic | (adjective) expressing or feeling or resulting from sympathy or compassion or friendly fellow feelings; disposed toward | - |
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| (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: appealing, likable, likeable |
| (adjective) of or relating to the sympathetic nervous system | - |
| (adjective) relating to vibrations that occur as a result of vibrations in a nearby body | Synonyms: harmonic |
| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, openhearted |
| (adjective) having similar disposition and tastes | - |
| sympathomimetic | (adjective) relating to epinephrine (its release or action) | Synonyms: adrenergic |
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| sympatric | (adjective) (of biological species or speciation) occurring in the same or overlapping geographical areas | - |
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| sympetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: gamopetalous |
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| symphonic | (adjective) relating to or characteristic or suggestive of a symphony | - |
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| (adjective) harmonious in sound | Synonyms: symphonious |
| symphonious | (adjective) harmonious in sound | Synonyms: symphonic |
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| symptomatic | (adjective) relating to or according to or affecting a symptom or symptoms | - |
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| (adjective) characteristic or indicative of a disease | Synonyms: diagnostic |
| symptomless | (adjective) having no symptoms of illness or disease | Synonyms: asymptomatic |
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| synaesthetic | (adjective) relating to or experiencing synesthesia; involving more than one sense | Synonyms: synesthetic |
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| synaptic | (adjective) (neuroscience) of or involving synapses | - |
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| syncarpous | (adjective) (of ovaries of flowering plants) consisting of united carpels | - |
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| syncategorematic | (adjective) of a term that cannot stand as the subject or (especially) the predicate of a proposition but must be used in conjunction with other terms | - |
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| synchronal | (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronic, synchronous |
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| synchronic | (adjective) concerned with phenomena (especially language) at a particular period without considering historical antecedents | - |
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| (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronal, synchronous |
| (adjective) (of taxa) occurring in the same period of geological time | - |
| synchronised | (adjective) operating in unison | Synonyms: synchronized |
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| synchronized | (adjective) operating in unison | Synonyms: synchronised |
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| synchronous | (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronal, synchronic |
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| (adjective) (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions | - |
| synclinal | (adjective) sloping downward toward each other to create a trough | - |
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| syncopated | (adjective) stressing a normally weak beat | - |
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| syncretic | (adjective) of or characterized by syncretism | Synonyms: syncretical, syncretistic, syncretistical |
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| (adjective) relating to a historical tendency for a language to reduce its use of inflections | Synonyms: syncretical, syncretistic, syncretistical |
| syncretical | (adjective) of or characterized by syncretism | Synonyms: syncretic, syncretistic, syncretistical |
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| (adjective) relating to a historical tendency for a language to reduce its use of inflections | Synonyms: syncretic, syncretistic, syncretistical |
| syncretistic | (adjective) of or characterized by syncretism | Synonyms: syncretic, syncretical, syncretistical |
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| (adjective) relating to a historical tendency for a language to reduce its use of inflections | Synonyms: syncretic, syncretical, syncretistical |
| syncretistical | (adjective) of or characterized by syncretism | Synonyms: syncretic, syncretical, syncretistic |
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| (adjective) relating to a historical tendency for a language to reduce its use of inflections | Synonyms: syncretic, syncretical, syncretistic |
| syndetic | (adjective) connected by a conjunction | - |
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| synecdochic | (adjective) using the name of a part for that of the whole or the whole for the part; or the special for the general or the general for the special; or the material for the thing made of it | Synonyms: synecdochical |
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| synecdochical | (adjective) using the name of a part for that of the whole or the whole for the part; or the special for the general or the general for the special; or the material for the thing made of it | Synonyms: synecdochic |
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| synergetic | (adjective) working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect | Synonyms: synergistic |
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| synergistic | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: interactive |
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| (adjective) of or relating to the theological doctrine of synergism | - |
| (adjective) working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect | Synonyms: synergetic |
| synesthetic | (adjective) relating to or experiencing synesthesia; involving more than one sense | Synonyms: synaesthetic |
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| synoecious | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoicous |
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| synoicous | (adjective) having male and female reproductive organs mixed in the same gametoecium | Synonyms: synoecious |
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| synonymous | (adjective) (of words) meaning the same or nearly the same | - |
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| synoptic | (adjective) presenting a summary or general view of a whole | - |
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| (adjective) presenting or taking the same point of view; used especially with regard to the first three gospels of the New Testament | Synonyms: synoptical |
| synoptical | (adjective) presenting or taking the same point of view; used especially with regard to the first three gospels of the New Testament | Synonyms: synoptic |
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| synovial | (adjective) relating to or secreting synovia | - |
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| synsemantic | (adjective) of a word or phrase meaningful only when it occurs in the company of other words | - |
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| syntactic | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactical |
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| syntactical | (adjective) of or relating to or conforming to the rules of syntax | Synonyms: syntactic |
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| syntagmatic | (adjective) related as members of a syntagma | - |
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| synthetic | (adjective) of a proposition whose truth value is determined by observation or facts | Synonyms: synthetical |
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| (adjective) systematic combining of root and modifying elements into single words | - |
| (adjective) involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis | Synonyms: synthetical |
| (adjective) not of natural origin; prepared or made artificially | Synonyms: man-made, semisynthetic |
| (adjective) not genuine or natural | - |
| (adjective) artificial as if portrayed in a film | Synonyms: celluloid |
| synthetical | (adjective) involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis | Synonyms: synthetic |
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| (adjective) of a proposition whose truth value is determined by observation or facts | Synonyms: synthetic |
| syphilitic | (adjective) of or relating to or infected with syphilis | - |
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| syrupy | (adjective) with honey added | Synonyms: honeyed, honied |
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| (adjective) overly sweet | Synonyms: cloying, saccharine, treacly |
| (adjective) having a relatively high resistance to flow | Synonyms: viscous |
| systematic | (adjective) characterized by order and planning | - |
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| (adjective) of or relating to taxonomy | Synonyms: taxonomic, taxonomical |
| systemic | (adjective) affecting an entire system | - |
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| systolic | (adjective) of or relating to a systole or happening during a systole | - |
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