Adverbs starting with the letter S are listed here. Many kinds of adverbs are included which can be useful for creating interesting sentences.
sacredly, sacrilegiously, sadly, safely, sagaciously, sagely, salaciously, sanctimoniously, sanely, sapiently, sarcastically, sardonically, satirically, satisfactorily, satisfyingly, saucily.
scandalously, scantily, scarce, scarcely, scarily, scathingly, scenically, sceptically, schematically, schismatically, scholastically, scienter, scientifically, scoffingly, scorching, scornfully, scrappily, screakily, screamingly, scrumptiously, scrupulously, scurrilously, scurvily.
searchingly, seasonably, seasonally, seaward, seawards, second, secondarily, secondhand, secondly, secretively, secretly, securely, sedately, seductively, sedulously, seekingly, seemingly, seldom, selectively, selfishly, selflessly, semantically, semiannually, semimonthly, semiweekly, sensationally, senselessly, sensibly, sensitively, sensually, sensuously, sententiously, sentimentally, separably, separately, sequentially, serenely, serially, seriatim, seriously, servilely, sevenfold, seventhly, severally, severely.
shabbily, shaggily, shakily, shallowly, shambolically, shamefacedly, shamefully, shamelessly, shapelessly, sharp, sharply, sheepishly, sheer, shiftily, shiningly, shockingly, shoddily, shore, short, shortly, showily, shrewdly, shrewishly, shrilly, shudderingly, shyly.
sickeningly, sidearm, sidelong, sidesaddle, sidesplittingly, sideward, sidewards, sideway, sideways, sidewise, signally, significantly, silently, silkily, similarly, simperingly, simply, simultaneously, since, sincerely, singlehandedly, singly, singularly, sinuously, sinusoidally, sixfold, sixthly.
skeptically, sketchily, skilfully, skillfully, skimpily, skittishly, skyward, skywards.
slackly, slanderously, slangily, slantingly, slantways, slantwise, slap, slapdash, slavishly, sleekly, sleepily, sleeplessly, slenderly, slickly, slightingly, slightly, slimly, slopingly, sloppily, slouchily, slouchingly, slow, slower, slowest, slowly, sluggishly, slyly.
smack, small, smarmily, smart, smartly, smash, smashingly, smilingly, smolderingly, smoothly, smoulderingly, smugly, smuttily.
snappishly, sneakily, sneakingly, sneeringly, snidely, snobbishly, snootily, snugly.
soaking, sobbingly, soberly, sociably, socially, sociobiologically, socioeconomically, sociolinguistically, sociologically, soddenly, sofar, soft, softly, solely, solemnly, solicitously, solidly, solitarily, solo, somberly, sombrely, some, someday, somehow, someplace, sometime, sometimes, someway, someways, somewhat, somewhere, somewheres, somnolently, sonorously, soon, sooner, soonest, soothingly, sopping, sordidly, sorely, sorrowfully, sort, sottishly, soughingly, soulfully, soullessly, soundlessly, soundly, sourly, south, southeast, southeastward, southeastwardly, southerly, southward, southwards, southwest, southwestward, southwestwardly.
spaceward, spacewards, spaciously, sparingly, sparsely, spasmodically, spatially, specially, specifically, speciously, spectacularly, spectrally, spectrographically, speculatively, speechlessly, speedily, spherically, spicily, spinally, spirally, spiritedly, spiritually, spitefully, splendidly, spontaneously, spookily, sporadically, sportingly, sportively, spotlessly, sprucely, spuriously.
squalidly, square, squarely, squeamishly.
stably, staccato, staggeringly, stagily, staidly, stanchly, standoffishly, stark, starkly, startlingly, statewide, statistically, statutorily, staunchly, steadfastly, steadily, steady, stealthily, steaming, steeply, stepwise, stereotypically, sternly, stertorously, stickily, stiff, stiffly, still, stiltedly, stingily, stirringly, stochastically, stockily, stodgily, stoically, stolidly, stonily, stormily, stoutly, stragglingly, straight, straightaway, straightforwardly, straightway, strangely, strategically, strenuously, strictly, stridently, strikingly, stringently, strong, strongly, structurally, stubbornly, studiously, stuffily, stunningly, stupendously, stupidly, sturdily, stylishly, stylistically.
suavely, subconsciously, subcutaneously, subjectively, sublimely, submissively, subsequent, subsequently, subserviently, substantially, substantively, subtly, successfully, successively, succinctly, such, suddenly, sufficiently, suggestively, suitably, sulkily, sullenly, sultrily, summarily, sumptuously, sunnily, super, superbly, superciliously, superficially, superfluously, superlatively, supernaturally, superstitiously, supinely, supposedly, supra, supremely, sure, surely, surgically, surlily, surpassingly, surprisedly, surprisingly, surreptitiously, suspiciously.
sweepingly, sweet, sweetly, swiftly, swimmingly.
sycophantically, syllabically, symbiotically, symbolically, symmetrically, sympathetically, symptomatically, synchronously, synergistically, synonymously, syntactically, synthetically, systematically.
There are lots of other useful posts on Adverb1.com to explore which are similar to the above S adverbs list but which start with different letters for example.