senility, n. dotage, decrepitude, old age.

seniority, n. eldership, superiority.

sensation, n. consciousness, feeling, perception; excitement.  Associated Words:  aesthesiology, sensorium, sentient, sensific, sensory, sentiency, insentient, sensifacient, sensiferous, sensificatory, sensitive, aesthesiometer, aesthesiogen, catalepsy, anaesthesia.

sensational, a. melodramatic, emotional, exciting, thrilling.

sense, n. perception, sensation, sensibility, feeling, aesthesia; apprehension, understanding; wisdom, sagacity; judgment, notion, opinion, sentiment, view; conviction, consciousness.  Associated Words:  aesthematology, aesthesiography, sensuous, sensual, sensuality, sensuousness.

sense, v. (Colloq.) perceive, recognize.

senseless, a. insensible, unconscious; absurd, silly, nonsensical, inept, foolish, idiotic, fatuous, unwise.

senselessness, n. insensibility, unconsciousness; fatuity, absurdity.

sensibility, n. susceptibility, sensitiveness, delicacy, feeling, emotion.

sensible, a. apprehensible, perceptible; susceptible, impressible, conscious, cognizant, aware; wise, judicious, discreet, intelligent.  Antonyms:  insensible, unconscious.

sensitive, a. susceptible, impressible, sentient, irritable.

sensual, a. unspiritual, carnal, fleshly, sensuous; voluptuous, luxurious, sybaritic, wanton, licentious, self-indulgent.

sensualist, n. voluptuary, epicure, sybarite.

sensuality, n. voluptuousness, carnality, sybaritism; wantonness, licentiousness, self-gratification.

sensuous, a. sensual.  Antonym:  insensuous.

sentence, n. opinion, decision, determination, judgment; axiom, maxim, precept, posy, adage, epigram, apothegm, saying.

sententious, a. terse, pithy, laconic, epigrammatic.

sentient, a. sensitive, perceptive, conscious, susceptible.  Antonyms:  insentient, insusceptible.

sentiment, n. thought, feeling; judgment, notion, opinion; maxim, saying, toast; sensibility, susceptibility.

sentimental, a. romantic, impressible, emotional, lackadaisical.  Antonyms:  unsentimental, matter-of-fact, pragmatical.

sentinel, n. guard, sentry, watchman, picket, vidette, perdue.  Associated Word:  cordon.

separable, a. divisible, detachable, severable, partible.  Antonym:  inseparable.

separate, v. divide, dissolve, detach, sunder, sever, disconnect, part, disjoin, withdraw, rend, dissociate, disengage, isolate, disunite, eliminate, disintegrate, segregate, scatter, disperse, dissipate, sequester, cleave, insulate, dissever, deglutinate.

separate, a. detached, disconnected, disjoined, separated, apart, distinct, isolated, segregated, disunited, severed, withdrawn.

separation, n. division, segregation, disunion, disconnection, sequestration, disjunction, dissolution, disengagement, disintegration, insulation, isolation, rupture, dissociation, divorce, analysis, decomposition, detachment, demarcation, severance, partition, deglutination.