sagacity.noun
the quality of being discerning, sound in judgment, and farsighted; wisdom

sober, soberer, soberest.adjective
habitually abstemious (moderation) in the use of alcoholic liquors or drugs; temperate (moderate); not intoxicated or affected by the use of drugs; plain or subdued (sober attire for the funeral); devoid of frivolity, excess, exaggeration, or speculative imagination; straightforward (gave a sober assessment of the situation); marked by seriousness, gravity, or solemnity of conduct or character; serious; marked by circumspection and self-restraint
sober, sobered, sobering, sobers.transitive.&.intransitive use
to make or become sober
soberly.adverb
soberness.noun

sporadic also sporadical.adjective
occurring at irregular intervals; having no pattern or order in time; periodic; appearing singly or at widely scattered localities, as a plant or disease; isolated; unique (a sporadic example)
sporadically.adverb
sporadicalness.noun

sociopath.noun
one who is affected with a personality disorder marked by aggressive, antisocial behavior
sociopathic.adjective

stratigraphy.noun
the study of rock strata, especially the distribution, deposition, and age of sedimentary rocks
stratigraphic or stratigraphical.adjective
stratigraphically.adverb

stupor.noun
a state in which the mind and senses are dulled

stupefy, stupefied, stupefying, stupefies.transitive verbs
to dull the senses or faculties of; daze; to amaze; astonish
stupefier.noun
stupefyingly.adverb

synchronic.adjective
concerned with events existing in a limited time period and ignoring historical antecedents 
synchronical.adjective
synchronically.adverb

synchrony.noun
inflected form(s).plural.synchronies
synchronistic occurrence, arrangement, or treatment
synchronize.intransitive verb
to occur at the same time or rate
synchronization.noun

synchronous.adjective
occurring or existing at the same time; contemporary; moving or operating at the same rate; having identical periods; having identical period and phase
synchronously.adverb
synchronousness.noun

sync.noun
synchronization; harmony; accord.(in sync with today's fashions)
sync, synced, syncing, syncs.intransitive & transitive verbs-
to synchronize
synchronize, synchronized, synchronizing, synchronizes.verbs
intransitive verb use.to occur at the same time; be simultaneous; to operate in unison
transitive verb use.to cause to occur or operate with exact coincidence in time or rate (we synchronized our watches); to cause to occur or operate at the same time as something else (they synchronized their trip with the annual tulip festival); to arrange (historical events) in a synchronism so as to indicate parallel occurrence; to cause (soundtrack and action) to match exactly in a film

synchronism.noun
coincidence in time; simultaneousness; a chronological (arranged in order of time of occurrence) listing of historical personages or events so as to indicate parallel existence or occurrence
synchronistic.or.synchronistical.adjective
synchronistically.adverb

synchronicity.noun,.plural.synchronicities
the state or fact of being synchronous or simultaneous; synchronism; coincidence of events that seem to be meaningfully related, conceived in the theory of Carl Jung as an explanatory principle on the same order as causality

superintend, superintended, superintending, superintends.transitive verbs
to oversee and direct; supervise
superintendence.noun

supervise, supervised, supervising, supervises.transitive verbs
to have the charge and direction of; superintend

snappish.adjective
irritable and curt.(a snappish tone of voice); likely to snap or bite (a snappish mongrel)
snappishly.adverb
snappishness.noun

splendor.noun
great light or luster; brilliance; magnificent appearance or display; grandeur; something grand or magnificent; great fame; glory
splendorous.or.splendrous.adjective

sumptuous.adjective
of a size or splendor suggesting great expense; lavish
sumptuously.adverb
sumptuousness.noun

sheen.noun
glistening brightness; luster.(the sheen of old satin in candlelight); splendid.attire; a glossy surface given to textiles

stammer, stammered, stammering, stammers.verbs
intransitive and transitive verb use.to speak with involuntary pauses or repetitions; stutter
stammer.noun
away of speaking characterized by involuntary pauses or repetitions
stammerer.noun
stammeringly.adverb

sensitive.adjective
capable of perceiving with a sense or senses; responsive to external conditions or stimulation; susceptible to the attitudes, feelings, or circumstances of others
sensitively.adverb
sensitiveness.noun

sensitivity.noun,.plural.sensitivities
the quality or condition of being sensitive; the capacity of an organ or organism to respond to stimulation
Electronics.-.the degree of response of a receiver or an instrument to an incoming signal or to a change in the incoming signal; the signal strength required by an FM tuner to reduce noise and distortion; the degree of response of a plate or film to light, especially to light of a specified wavelength

stumble, stumbled, stumbling, stumbles.verbs
intransitive verb use.to miss one's step in walking or running; trip and almost fall; to proceed unsteadily or falteringly; flounder (she has proceeded though stumbling through life); blunder; to act or speak falteringly or clumsily; to make a mistake; blunder
stumbler.noun
stumblingly.adverb

slave.noun.from the widespread enslavement of captured Slavs {Bulgarian, Belorussian, Czech, Macedonian, Polish, Russian, Serbo-Croatian, Slovak, Slovene, Ukrainian, and Wendish} in the early Middle Ages)
defined by law and custom as the most absolute involuntary form of human servitude; one bound in servitude as the property of those governing (governments are corporations), whether they may be governments, another person or an household; although slavery is outlawed, it continues by those creating restrictively oppressive policies which are promoted in so called free countries in order to confuse to maintain unfair advantage, effectively keeping populaces in slavery status (policies include needless taxes - which is all taxes once you understand money creation, so a populace can be left with barely enough to eat to live to work again to eat to live and over decades, little changes from sparse existence for the majority) and in unsubmissive resistance to the United Nations Universal Declaration of Human Rights where it was adopted to provide for the suppression and prohibition and complete abolition of slavery in all forms; peonage
slave, slaved, slaving, slaves.intransitive verbs
to work very hard or doggedly; to toil for sustenance

slavery.noun,.plural.slaveries
the state of one bound in servitude as the property of a slaveholder or household; the practice of owning slaves; the condition of being subject to a specified influence (wage slavery)