sin, v. do wrong, trespass, transgress.

sincere, a. heartfelt, genuine, unfeigned, undissembling.  Antonyms:  See insincere.

sincerity, n. honesty, unaffectedness, frankness.  Antonyms:  insincerity, dissimulation.

sinew, n. tendon; muscle, thew.

sinful, a. iniquitous, wrong, immoral, wicked, depraved, vicious, unrighteous.

sinfulness, n. iniquity, immorality, depravity, wickedness.

sing, v. carol, warble, chant, hymn, hum, troll, yodel, croon.

singe, v. sweal, swale, scorch.

singer, n. vocalist, songster, songstress, minstrel, chanter, cantatrice, cantor, prima donna, precentor, bard, troubadour, jongleur, musician.

single, a. individual, alone, particular, isolated, sporadic, solitary; unmarried, celibate; simple, unmixed; honest, sincere, ingenuous, frank.

single, v. single out, choose, select, separate, isolate, segregate.

single-hearted, a. sincere, honest, guileless.

single-minded, a. artless, undesigning, guileless.

singsong, n. monotone.—­a. monotonous, drawling.

singular, a. unusual, unconventional, uncommon, strange, peculiar, unwonted, rare, extraordinary, exceptional, odd, whimsical, eccentric, bizarre, queer, unique, unprecedented, unexampled, curious.

singularity, n. peculiarity, idiosyncrasy, individuality; curiosity, freak, abnormality, rarity, abnormity, queerness, eccentricity.

sinister, a. left; unlucky, inauspicious, evil, wrong, forbidding.

sink, v. subside, descend, decline, fall; immerse, submerge, engulf, merge.

sinker, n. plummet.

sinking, n. subsidence, fall, decrease, decline.

sinless, a. innocent, guiltless, undefiled, perfect, blameless, faultless.

sinner, n. wrong-doer, delinquent, miscreant, trespasser.  See wrong-doer.

siren, a. bewitching, fascinating, enticing.

sister, n.  Associated Words:  sororicide, sororize, sorosis, sororal.

site, n. location.

sitting, n.  Associated Words:  sedentary, assession, astasia.

situation, n. position, place, post, employment, job, location, site, station, position; circumstance, condition, plight, predicament, exigency.

sitz bath. hip bath.

six, n.  Associated Words:  sexenary, hexaplar, sextant, sextuple, sextet, sestet, sextic, senary.

six-cornered, a. hexangular, hexagonal.

six days. hexahemeron.

six fingers or toes.  Associated Words:  sexidigitism, sexidigitist.

sixfold, a. sextuple.

six-footed, a. hexapod.

six months. semester.  Associated Words:  half-yearly, semi-annual, bi-annual, semestral.

six-sided, a. cubic, hexahedral, hexagonal.

six-sided body. cube, hexahedron.

six-sided figure. hexagon.

sixty, n.  Associated Words:  sexagenary, sexagesimal.