| 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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