stealth.noun
the act of moving, proceeding, or acting in a covert way; the quality or characteristic of being furtive or covert
stealthy, stealthier, stealthiest.adjectives
marked by or acting with quiet, caution and secrecy intended to avoid notice; secret
stealthily.adverb
stealthiness.noun

strident.adjective
loud, harsh, grating, or shrill; discordant; vociferous
stridence or stridency.noun
stridently.adverb

serene.adjective
unaffected by disturbance; calm and unruffled; unclouded; fair: serene skies and a bright blue sea
serenely.adverb
sereneness.noun

serenity.noun
the state or quality of being serene; tranquility; equanimity

sloppy, sloppier, sloppiest.adjectives
marked by a lack of care or precision; slipshod; marked by a lack of neatness or order; untidy (a sloppy room)
sloppily.adverb
sloppiness.noun

somber.adjective
dark; gloomy; dull or dark in color; melancholy; dismal-(a somber mood); serious; grave; from *sombrer, meaning 'to cast a shadow'
somberly.adverb
somberness.noun

shuck.noun
a husk, pod, or shell, as of an ear of corn, a pea, or a hickory nut; the shell of an oyster or a clam; something worthless; often used in the plural (an issue that didn't amount to shucks
shuck, shucked, shucking, shucks
to remove the husk or shell from; to cast off: shucked their coats and cooled off; a city trying to shuck a sooty image
shucks.interjection
used to express mild disappointment, disgust, or annoyance (ah shucks)
shucker.noun

serotonin.noun
a messenger.(carries messages to and from cells; mRNA, DNA; see also rRNA, tRNA).molecule, an organic compound, C₁₀H₁₂N₂O, formed from tryptophan and found in animal and human tissue, especially the brain, blood serum and gastric mucous membranes, active in vasoconstriction, stimulation of the smooth muscles, transmission of impulses between nerve cells and regulation of cyclic body processes

screech.noun
a high pitched, strident cry; a sound suggestive of this cry (the screech of train brakes)
screech, screeched, screeching, screeches.verbs
transitive verb use.to utter in or as if in a screech
intransitive verb use.to cry out in a high pitched, strident voice; scream; to make a sound suggestive of a screech (tires screeched on the pavement)
screecher, screechiness.nouns
screechy.adjective

solicitous.adjective
anxious or concerned (a solicitous parent); expressing care or concern (made solicitous inquiries about our family); thoughtful; full of desire; eager; marked by or given to anxious care and often hovering attentiveness; extremely careful; meticulous (solicitous in matters of behavior)
solicitously.adverb
solicitousness.noun

solicitude.noun
the state of being solicitous; care or concern, as for the wellbeing of another

strenuous.adjective
requiring great effort, energy or exertion: a strenuous task; vigorously active; energetic or zealous
strenuously.adverb

swarm.noun
a large number of insects or other small organisms, especially when in motion; a group of bees with a queen bee in migration to establish a new colony; flock; an aggregation of persons or animals, especially when in turmoil or moving in mass (a swarm of friends congratulated him)
swarm, swarmed, swarming, swarms.verbs
intransitive use-to move or emerge in a swarm; to leave a hive as a swarm (used of bees); to move or gather in large numbers
to be overrun; teem (a riverbank swarming with insects; teem
transitive use-to fill with a crowd (sailors swarming the ship's deck)
swarmer.noun

splendid.adjective
brilliant with light or color; radiant (a splendid field of poppies); imposing by reason of showiness or grandeur; magnificent: splendid costumes; admired by many; illustrious-(splendid achievements); surpassing (splendid character); very good or satisfying; praiseworthy (a splendid performance)
splendidly.adverb
splendidness.noun

surpass, surpassed, surpassing, surpasses.transitive verbs
to be beyond the limit, powers, or capacity of; transcend (misery that surpasses comprehension); to be or go beyond, as in degree or quality; exceed; excel

strive, strove, striven or strived, striving, strives.intransitive verbs
fight; engage in struggle, war of words, quarreling, wrangling, disputatious; to exert much effort or energy; endeavor; contend.(strive against)
strive.noun
strivingly.adverb

strife.noun
heated, often violent dissension; bitter conflict; discord; a struggle, fight, or quarrel; contention or competition between rivals

specialize, specialized, specializing, specializes.verbs
intransitive verb use.to pursue a special activity, occupation, or field of study; undergo specialization; to concentrate on a particular activity or product (the shop specializes in mountain climbing gear)
transitive verb use.to make specific mention of; particularize; to give a particular character or function to (specialized her field of research)
specialization.noun
the act of specializing or the process of becoming specialized

special.adjective
surpassing what is common or usual (a special occasion; a special treat); distinct among others of a kind (a special type of paint) 
special.noun
something arranged, issued, or appropriated to a particular service or occasion (rode to work on the commuter special)
specially.adverb
specialness .noun

specialist.noun
one who is devoted to a particular occupation or branch of study or research; one such as a physician whose practice is limited to a particular branch (such as medicine or surgery
specialist.adjective

serf.noun
a member of a servile, feudal.class of people in Europe, bound to the land and owned by a lord; a slave; a person in servitude (adopting Karl Marx's communistic income tax has made slaves of many)
serfdom.noun

scoundrel.noun
a villain; a rogue
scoundrelly.adjective

scallywag.or.scalawag.noun
a reprobate; a rascal