| rebellious | (adjective) discontented as toward authority | Synonyms: disaffected, ill-affected, malcontent |
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| (adjective) participating in organized resistance to a constituted government | - |
| (adjective) resisting control or authority | - |
| reckless | (adjective) marked by defiant disregard for danger or consequences | Synonyms: foolhardy, heady, rash |
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| (adjective) characterized by careless unconcern | Synonyms: heedless |
| recoilless | (adjective) of or being a weapon that is designed to minimize recoil | - |
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| regardless | (adjective) (usually followed by `of') without due thought or consideration | Synonyms: careless |
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| relentless | (adjective) never-ceasing | Synonyms: persistent, unrelenting |
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| (adjective) not to be placated or appeased or moved by entreaty | Synonyms: grim, inexorable, stern, unappeasable, unforgiving, unrelenting |
| religious | (adjective) having or showing belief in and reverence for a deity | - |
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| (adjective) of or relating to clergy bound by monastic vows | - |
| (adjective) concerned with sacred matters or religion or the church | Synonyms: spiritual |
| (adjective) extremely scrupulous and conscientious | - |
| remiss | (adjective) failing in what duty requires | Synonyms: delinquent, derelict, neglectful |
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| remorseless | (adjective) without mercy or pity | Synonyms: pitiless, ruthless, unpitying |
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| repetitious | (adjective) characterized by repetition | Synonyms: repetitive |
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| resinous | (adjective) having the characteristics of pitch or tar | Synonyms: pitchy, resiny, tarry |
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| resistless | (adjective) impossible to resist; overpowering | Synonyms: irresistible |
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| (adjective) offering no resistance, passively accepting of a situation | Synonyms: unresisting |
| resourceless | (adjective) lacking or deficient in natural resources | - |
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| restless | (adjective) lacking or not affording physical or mental rest | Synonyms: uneasy |
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| (adjective) worried and uneasy | Synonyms: ungratified, unsatisfied |
| (adjective) ceaselessly in motion | - |
| (adjective) nervous and unable to relax | Synonyms: antsy, fidgety, fretful, itchy |
| rhizomatous | (adjective) producing or possessing or resembling rhizomes | - |
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| rhymeless | (adjective) not having rhyme | Synonyms: rimeless, unrhymed, unrimed |
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| ribless | (adjective) having no ribs or no visible ribs | - |
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| ridiculous | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous |
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| (adjective) broadly or extravagantly humorous; resembling farce | Synonyms: farcical, ludicrous |
| (adjective) inspiring scornful pity | Synonyms: pathetic, silly |
| righteous | (adjective) characterized by or proceeding from accepted standards of morality or justice | - |
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| (adjective) morally justified | - |
| rigorous | (adjective) demanding strict attention to rules and procedures | Synonyms: stringent, tight |
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| (adjective) rigidly accurate; allowing no deviation from a standard | Synonyms: strict |
| rimeless | (adjective) not having rhyme | Synonyms: rhymeless, unrhymed, unrimed |
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| rimless | (adjective) lacking a rim or frame | - |
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| riotous | (adjective) produced or growing in extreme abundance | Synonyms: exuberant, lush, luxuriant, profuse |
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| (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, fast, libertine, profligate |
| (adjective) characterized by unrest or disorder or insubordination | Synonyms: disruptive, troubled, tumultuous, turbulent |
| riskless | (adjective) thought to be devoid of risk | Synonyms: risk-free, unhazardous |
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| rivalrous | (adjective) eager to surpass others | Synonyms: emulous |
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| roadless | (adjective) lacking pathways | Synonyms: pathless, trackless, untracked, untrod, untrodden |
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| robustious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, rambunctious, rumbustious, unruly |
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| roofless | (adjective) not having a roof | - |
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| (adjective) physically or spiritually homeless or deprived of security | Synonyms: dispossessed, homeless |
| rootless | (adjective) wandering aimlessly without ties to a place or community | Synonyms: vagabond |
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| rosaceous | (adjective) of or pertaining to or characteristic of plants of the family Rosaceae | - |
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| (adjective) of something having a dusty purplish pink color | Synonyms: rose, roseate |
| rudderless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, undirected |
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| ruinous | (adjective) causing injury or blight; especially affecting with sudden violence or plague or ruin | Synonyms: blasting |
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| (adjective) extremely harmful; bringing physical or financial ruin | Synonyms: catastrophic |
| rumbustious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, rambunctious, robustious, unruly |
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| rupicolous | (adjective) composed of or inscribed on rock | Synonyms: rupestral |
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| rustless | (adjective) without rust | - |
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| ruthless | (adjective) without mercy or pity | Synonyms: pitiless, remorseless, unpitying |
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| sacrilegious | (adjective) grossly irreverent toward what is held to be sacred | Synonyms: blasphemous, profane |
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| sagacious | (adjective) skillful in statecraft or management | - |
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| (adjective) acutely insightful and wise | Synonyms: perspicacious, sapient |
| salacious | (adjective) suggestive of or tending to moral looseness | Synonyms: lewd, obscene, raunchy |
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| (adjective) characterized by lust | Synonyms: lubricious, lustful, prurient |
| saliferous | (adjective) containing or yielding salt | - |
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| salubrious | (adjective) promoting health; healthful | Synonyms: good for you, healthy |
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| (adjective) favorable to health of mind or body | - |
| sanctimonious | (adjective) excessively or hypocritically pious | Synonyms: holier-than-thou, pharisaic, pharisaical, pietistic, pietistical, self-righteous |
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| sanguineous | (adjective) accompanied by bloodshed | Synonyms: butcherly, gory, sanguinary, slaughterous |
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| (adjective) confidently optimistic and cheerful | Synonyms: sanguine |
| sanious | (adjective) of or resembling or characterized by ichor or sanies | Synonyms: ichorous |
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| sapiens | (adjective) of or relating to or characteristic of Homo sapiens | - |
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| sapless | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, feeble, infirm, rickety, weak, weakly |
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| (adjective) destitute of sap and other vital juices; dry | - |
| saponaceous | (adjective) resembling or having the qualities of soap | Synonyms: soapy |
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| saporous | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid |
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| saprophagous | (adjective) (of certain animals) feeding on dead or decaying animal matter | Synonyms: saprozoic |
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| sarcolemnous | (adjective) of or relating to sarcolemma | Synonyms: sarcolemmic |
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| savorless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, insipid, savourless, vapid |
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| savourless | (adjective) lacking taste or flavor or tang | Synonyms: bland, flat, flavorless, flavourless, insipid, savorless, vapid |
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| saxicolous | (adjective) growing on or living among rocks | Synonyms: saxatile, saxicoline |
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| scabrous | (adjective) dealing with salacious or indecent material | - |
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| (adjective) rough to the touch; covered with scales or scurf | Synonyms: lepidote, leprose, scaly, scurfy |
| scaleless | (adjective) destitute of scales | - |
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| scandalous | (adjective) giving offense to moral sensibilities and injurious to reputation | Synonyms: disgraceful, shameful, shocking |
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| scentless | (adjective) lacking the sense of smell | - |
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| (adjective) emitting or holding no odor | - |
| scoreless | (adjective) having no points scores | Synonyms: goalless, hitless, pointless |
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| scotomatous | (adjective) relating to scotoma | - |
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| scrofulous | (adjective) afflicted with scrofula | - |
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| (adjective) morally contaminated | - |
| (adjective) having a diseased appearance resembling scrofula | - |
| scrumptious | (adjective) extremely pleasing to the sense of taste | Synonyms: delectable, delicious, luscious, pleasant-tasting, toothsome, yummy |
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| scrupulous | (adjective) having scruples; arising from a sense of right and wrong; principled | - |
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| (adjective) characterized by extreme care and great effort | Synonyms: conscientious, painstaking |
| scurrilous | (adjective) expressing offensive reproach | Synonyms: abusive, opprobrious |
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| seamless | (adjective) not having or joined by a seam or seams | - |
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| (adjective) perfectly consistent and coherent | - |
| (adjective) smooth, especially of skin | Synonyms: unlined, unseamed |
| sebaceous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, oleaginous |
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| seditious | (adjective) in opposition to a civil authority or government | Synonyms: insurgent, subversive |
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| (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, instigative, rabble-rousing |
| sedulous | (adjective) marked by care and persistent effort | Synonyms: assiduous |
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| seedless | (adjective) lacking seeds | - |
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| selfless | (adjective) showing unselfish concern for the welfare of others | Synonyms: altruistic |
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| semiconscious | (adjective) partially conscious; not completely aware of sensations | - |
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| seminiferous | (adjective) bearing or producing seed or semen | - |
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| semiprecious | (adjective) used of gemstones having less commercial value than precious stones | - |
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| senseless | (adjective) (of especially persons) lacking sense or understanding or judgment | Synonyms: nitwitted, soft-witted, witless |
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| (adjective) unresponsive to stimulation | Synonyms: insensible, out of it |
| (adjective) not marked by the use of reason | Synonyms: mindless, reasonless |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, superfluous, wasted |
| sensuous | (adjective) taking delight in beauty | - |
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| sententious | (adjective) concise and full of meaning | Synonyms: pithy |
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| (adjective) abounding in or given to pompous or aphoristic moralizing | - |
| serendipitous | (adjective) lucky in making unexpected and fortunate discoveries | - |
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| sericeous | (adjective) covered with fine soft hairs or down | Synonyms: downy, puberulent, pubescent |
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| serious | (adjective) concerned with work or important matters rather than play or trivialities | - |
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| (adjective) completely lacking in playfulness | Synonyms: sober, unplayful |
| (adjective) causing fear or anxiety by threatening great harm | Synonyms: dangerous, grave, grievous, life-threatening, severe |
| (adjective) requiring effort or concentration; complex and not easy to answer or solve | - |
| (adjective) of great consequence | - |
| (adjective) appealing to the mind | Synonyms: good |
| serous | (adjective) of or producing or containing serum | - |
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| setaceous | (adjective) having or covered with protective barbs or quills or spines or thorns or setae etc. | Synonyms: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setose, spiny, thorny |
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| sexless | (adjective) sexually unattractive | - |
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| (adjective) having no or imperfectly developed or nonfunctional sex organs | Synonyms: neuter |
| (adjective) having no sexual desire | - |
| shameless | (adjective) feeling no shame | Synonyms: unblushing |
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| shapeless | (adjective) having no definite form or distinct shape | Synonyms: amorphous, formless |
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| (adjective) lacking symmetry or attractive form | - |
| shiftless | (adjective) lacking or characterized by lack of ambition or initiative | - |
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| shitless | (adjective) (used as complement) to the utmost degree | Synonyms: witless |
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| shoeless | (adjective) without shoes | Synonyms: barefoot, barefooted |
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| sideways | (adjective) (of movement) at an angle | Synonyms: crabwise |
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| sightless | (adjective) lacking sight | Synonyms: eyeless, unseeing |
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| siliceous | (adjective) relating to or containing or resembling silica | Synonyms: silicious |
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| silicious | (adjective) relating to or containing or resembling silica | Synonyms: siliceous |
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| simultaneous | (adjective) occurring or operating at the same time | Synonyms: co-occurrent, coincident, coincidental, coinciding, concurrent, cooccurring |
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| sinless | (adjective) free from sin | Synonyms: impeccant, innocent |
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| sinuous | (adjective) curved or curving in and out | Synonyms: sinuate, wiggly |
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| (adjective) gracefully thin and bending and moving with ease | Synonyms: lissom, lissome, lithe, lithesome, supple |
| skinless | (adjective) having no skin | - |
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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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| slaughterous | (adjective) accompanied by bloodshed | Synonyms: butcherly, gory, sanguinary, sanguineous |
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| slaveless | (adjective) where slavery was prohibited | Synonyms: free-soil, non-slave |
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| sleepless | (adjective) always watchful | Synonyms: lidless |
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| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, watchful |
| sleeveless | (adjective) having no sleeves | - |
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| (adjective) unproductive of success | Synonyms: bootless, fruitless, futile, vain |
| slumberous | (adjective) inclined to or marked by drowsiness | Synonyms: slumbery, slumbrous, somnolent |
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| (adjective) quiet and tranquil | Synonyms: slumbrous |
| slumbrous | (adjective) inclined to or marked by drowsiness | Synonyms: slumberous, slumbery, somnolent |
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| (adjective) quiet and tranquil | Synonyms: slumberous |