| suppositious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, supposititious |
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| supposititious | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious |
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| suppressed | (adjective) kept from public knowledge by various means | - |
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| (adjective) manifesting or subjected to suppression | - |
| (adjective) held in check with difficulty | Synonyms: smothered, stifled, strangled |
| suppressive | (adjective) tending to suppress | - |
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| suppurative | (adjective) relating to or characterized by suppuration | - |
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| supranational | (adjective) transcending established national boundaries or spheres of interest | - |
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| supranormal | (adjective) beyond the range of the normal or scientifically explainable | Synonyms: supernormal |
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| supraocular | (adjective) located or occurring above the eye socket | Synonyms: supraorbital |
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| supraorbital | (adjective) located or occurring above the eye socket | Synonyms: supraocular |
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| suprasegmental | (adjective) pertaining to a feature of speech that extends over more than a single speech sound | - |
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| supreme | (adjective) greatest in status or authority or power | Synonyms: sovereign |
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| (adjective) greatest or maximal in degree; extreme | Synonyms: sublime |
| (adjective) highest in excellence or achievement | - |
| (adjective) final or last in your life or progress | - |
| surd | (adjective) produced without vibration of the vocal cords | Synonyms: hard, unvoiced, voiceless |
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| sure | (adjective) having or feeling no doubt or uncertainty; confident and assured | Synonyms: certain |
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| (adjective) certain to occur; destined or inevitable | Synonyms: certain |
| (adjective) exercising or taking care great enough to bring assurance | Synonyms: certain |
| (adjective) reliable in operation or effect | Synonyms: certain |
| (adjective) physically secure or dependable | - |
| (adjective) certain not to fail | - |
| (adjective) infallible or unfailing | - |
| (adjective) (of persons) worthy of trust or confidence | Synonyms: trusted |
| (adjective) impossible to doubt or dispute | Synonyms: indisputable |
| surefooted | (adjective) not liable to error in judgment or action | Synonyms: confident, sure-footed |
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| (adjective) not liable to stumble or fall | Synonyms: footsure, sure-footed |
| surface | (adjective) on the surface | - |
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| surficial | (adjective) pertaining to or occurring on or near the earth's surface | - |
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| surgical | (adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: operative |
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| (adjective) of or relating to or involving or used in surgery | - |
| (adjective) performed with great precision | - |
| surging | (adjective) characterized by great swelling waves or surges | Synonyms: billowing, billowy |
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| surly | (adjective) inclined to anger or bad feelings with overtones of menace | Synonyms: ugly |
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| surmisable | (adjective) capable of being inferred on slight grounds | Synonyms: presumable, supposable |
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| surmountable | (adjective) capable of being surmounted or overcome | - |
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| (adjective) capable of being surmounted | Synonyms: climbable |
| surmounted | (adjective) having something on top | - |
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| surpassing | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, olympian, prodigious |
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| (adjective) exceeding or surpassing usual limits especially in excellence | Synonyms: transcendent |
| surpliced | (adjective) wearing a surplice | - |
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| surplus | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, superfluous, supernumerary |
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| surprised | (adjective) taken unawares or suddenly and feeling wonder or astonishment | - |
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| surprising | (adjective) causing surprise or wonder or amazement | - |
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| surreal | (adjective) resembling a dream | Synonyms: dreamlike |
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| (adjective) characterized by fantastic imagery and incongruous juxtapositions | Synonyms: phantasmagoric, phantasmagorical, surrealistic |
| surrealistic | (adjective) characterized by fantastic imagery and incongruous juxtapositions | Synonyms: phantasmagoric, phantasmagorical, surreal |
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| surreptitious | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: furtive, sneak, sneaky, stealthy |
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| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, undercover, underground |
| surrogate | (adjective) providing or receiving nurture or parental care though not related by blood or legal ties | Synonyms: foster |
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| surrounded | (adjective) confined on all sides | Synonyms: encircled |
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| surrounding | (adjective) closely encircling | Synonyms: circumferent, encompassing |
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| surviving | (adjective) still in existence | Synonyms: living |
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| susceptible | (adjective) (often followed by `of' or `to') yielding readily to or capable of | - |
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| (adjective) easily impressed emotionally | - |
| suspect | (adjective) not as expected | Synonyms: fishy, funny, shady, suspicious |
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| suspected | (adjective) believed likely | - |
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| suspended | (adjective) (of undissolved particles in a fluid) supported or kept from sinking or falling by buoyancy and without apparent attachment | - |
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| suspenseful | (adjective) (of a situation) characterized by or causing suspense | Synonyms: cliff-hanging, nail-biting, suspensive |
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| suspensive | (adjective) undecided or characterized by indecisiveness | - |
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| (adjective) (of a situation) characterized by or causing suspense | Synonyms: cliff-hanging, nail-biting, suspenseful |
| suspicious | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, untrusting, wary |
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| (adjective) not as expected | Synonyms: fishy, funny, shady, suspect |
| sustainable | (adjective) capable of being sustained | - |
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| sustained | (adjective) maintained at length without interruption or weakening | - |
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| (adjective) (of an electric arc) continuous | Synonyms: free burning |
| sustentacular | (adjective) serving to sustain or support | - |
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| susurrant | (adjective) making a low continuous indistinct sound | Synonyms: murmuring, whispering |
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| susurrous | (adjective) characterized by soft sounds | Synonyms: murmurous, rustling, soughing |
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| tonsured | (adjective) having a bald spot either shaved or natural | - |
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| transuranic | (adjective) having an atomic number greater than 92 | - |
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| treasured | (adjective) characterized by feeling or showing fond affection for | Synonyms: cherished, precious, wanted |
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| unassuming | (adjective) not arrogant or presuming | Synonyms: retiring |
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| unassured | (adjective) lacking boldness or confidence | - |
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| unconsumed | (adjective) not consumed | - |
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| unconsummated | (adjective) not consummated (especially of a marriage) | - |
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| uninsurable | (adjective) not capable of being insured or not eligible to be insured | - |
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| uninsured | (adjective) not covered by insurance | - |
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| unmeasurable | (adjective) impossible to measure | Synonyms: immeasurable, immensurable |
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| unmeasured | (adjective) without limits in extent or size or quantity | Synonyms: illimitable, limitless, measureless |
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| (adjective) not composed of measured syllables; not metrical | - |
| unpersuadable | (adjective) not susceptible to persuasion | Synonyms: unsuasible |
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| unpersuaded | (adjective) not converted | Synonyms: unconverted |
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| unpersuasive | (adjective) not capable of persuading | - |
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| unreassuring | (adjective) not reassuring; tending to cause anxiety | Synonyms: worrisome |
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| unsuasible | (adjective) not susceptible to persuasion | Synonyms: unpersuadable |
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| unsubdivided | (adjective) (botany) of leaf shapes; of leaves having no divisions or subdivisions | Synonyms: simple |
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| unsubduable | (adjective) impossible to subdue | Synonyms: indomitable, never-say-die |
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| unsubdued | (adjective) not brought under control | - |
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| unsubmissive | (adjective) not servile or submissive | Synonyms: unservile |
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| unsubstantial | (adjective) lacking material form or substance; unreal | Synonyms: insubstantial, unreal |
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| unsubstantiated | (adjective) unsupported by other evidence | Synonyms: uncorroborated |
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| unsubtle | (adjective) lacking subtlety; obvious | Synonyms: broad |
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| unsuccessful | (adjective) not successful; having failed or having an unfavorable outcome | - |
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| (adjective) failing to accomplish an intended result | Synonyms: abortive, stillborn |
| unsufferable | (adjective) too extreme to bear | Synonyms: insufferable |
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| unsugared | (adjective) with no sugar added | - |
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| unsuitable | (adjective) not conducive to good moral development | - |
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| (adjective) not worthy of being chosen (especially as a spouse) | Synonyms: undesirable |
| (adjective) not meant or adapted for a particular purpose | - |
| (adjective) not capable of being applied | Synonyms: inapplicable |
| unsuited | (adjective) not easy to combine harmoniously | Synonyms: ill-sorted, incompatible, mismated |
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| unsullied | (adjective) spotlessly clean and fresh | - |
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| (adjective) (of reputation) free from blemishes | Synonyms: stainless, unstained, untainted, untarnished |
| unsung | (adjective) not famous or acclaimed | Synonyms: obscure, unknown |
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| (adjective) having value that is not acknowledged | Synonyms: unappreciated, unvalued |
| unsupervised | (adjective) not supervised or under constant observation | - |
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| unsupportable | (adjective) not able to be supported or defended | - |
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| unsupported | (adjective) not held up or borne | - |
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| (adjective) not sustained or maintained by nonmaterial aid | - |
| unsupportive | (adjective) not furnishing support or assistance | - |
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| unsuppressed | (adjective) given vent to | - |
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| unsure | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, uncertain |
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| (adjective) lacking self-confidence | Synonyms: diffident, shy, timid |
| unsurmountable | (adjective) not capable of being surmounted or overcome | Synonyms: insurmountable |
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| (adjective) incapable of being surmounted or climbed | Synonyms: unclimbable |
| unsurpassable | (adjective) not to be exceeded | - |
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| unsurpassed | (adjective) not capable of being improved on | Synonyms: unexceeded, unexcelled |
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| unsurprised | (adjective) not surprised or expressing surprise | Synonyms: not surprised |
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| unsurprising | (adjective) not causing surprise | - |
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| unsusceptible | (adjective) not susceptible to | Synonyms: insusceptible |
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| unsuspected | (adjective) not suspected or believed likely | - |
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| unsuspecting | (adjective) not suspicious | Synonyms: unsuspicious |
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| (adjective) (often followed by `of') not knowing or expecting; not thinking likely | - |
| unsuspicious | (adjective) not suspicious | Synonyms: unsuspecting |
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| unusual | (adjective) not usual or common or ordinary | - |
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| (adjective) being definitely out of the ordinary and unexpected; slightly odd or even a bit weird | Synonyms: strange |
| (adjective) not commonly encountered | - |
| uricosuric | (adjective) acting to increase the excretion of uric acid in the urine | - |
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| usual | (adjective) occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure | - |
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| (adjective) commonly encountered | Synonyms: common |
| usufructuary | (adjective) of or relating to the nature of a usufruct | - |
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| usurious | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, outrageous, steep, unconscionable |
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| visual | (adjective) relating to or using sight | Synonyms: ocular, optic, optical |
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| (adjective) visible | Synonyms: ocular |
| visualised | (adjective) seen in the mind as a mental image | Synonyms: envisioned, pictured, visualized |
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| visualized | (adjective) seen in the mind as a mental image | Synonyms: envisioned, pictured, visualised |
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