self-possession(n = noun.attribute) possession, self-command, self-control, self-will, will power, willpower - the trait of resolutely controlling your own behavior;
is a kind of firmness, firmness of purpose, resoluteness, resolution, resolve
has particulars: nerves, presence of mind

   The possession of one's powers; calmness; self-command; presence of mind; composure. [1913 Webster]

N  inexcitability, imperturbability, inirritability, even temper, tranquil mind, dispassion, tolerance, patience, coolth, passiveness, hebetude, hebetation, impassibility, stupefaction, coolness, calmness, composure, placidity, indisturbance, imperturbation, sang froid, tranquility, serenity, quiet, quietude, peace of mind, mental calmness, staidness, gravity, sobriety, Quakerism, philosophy, equanimity, stoicism, command of temper, self-possession, self-control, self-command, self-restraint, ice water in one's veins, presence of mind, submission, resignation, sufferance, supportance, endurance, longsufferance, forbearance, longanimity, fortitude, patience of Job, patience on a monument, patience 'sovereign o'er transmuted ill', moderation, repression of feelings, subjugation of feeling, restraint, tranquillization, inexcitable, unexcitable, imperturbable, unsusceptible, unpassionate, dispassionate, cold-blooded, irritable, enduring, stoical, Platonic, philosophic, staid, stayed, sober, sober minded, grave, sober as a judge, grave as a judge, sedate, demure, cool-headed, easy-going, peaceful, placid, calm, quiet as a mouse, tranquil, serene, cool as a cucumber, cool as a custard, undemonstrative, temperate, composed, collected, unexcited, unstirred, unruffled, undisturbed, unperturbed, unimpassioned, unoffended, unresisting, meek, tolerant, patient, patient as Job, submissive, tame, content, resigned, chastened, subdued, lamblike, gentle as a lamb, suaviter in modo, mild as mothers milk, soft as peppermint, armed with patience, bearing with, clement, long-suffering, like patience on a monument smiling at grief, aequo animo, in cold blood, more in sorrow than in anger, Int, patience!, and shuffle the cards, cool calm and collected, keep calm in the midst of a storm, adversity's sweet milk, philosophy, mens aequa in arduis philosophia stemma non inspec, quo me cumque rapit tempestas deferor hospes, they also serve who only stand and wait.

N  caution, cautiousness, discretion, prudence, cautel, heed, circumspection, calculation, deliberation, foresight, vigilance, warning, coolness, self-possession, self-command, presence of mind, sang froid, well-regulated mind, worldly wisdom, Fabian policy, cautious, wary, guarded, on one's guard, cavendo tutus, in medio tutissimus, vigilant, careful, heedful, cautelous, stealthy, chary, shy of, circumspect, prudent, discreet, politic, sure-footed, unenterprising, unadventurous, cool, steady, self-possessed, overcautious, cautiously, Int, have a care!, timeo Danaos, festina lente, ante victoriam ne canas triumphum, don't sing out victory before the triumph, give, every man thine ear but few thy voice, he who laughs last laughs best, il rit bien qui rit le dernier, ni firmes carta que no leas ni bebas agua que no v, nescit vox missa reverti, love all, trust a few, noli irritare leones, safe bind safe find, if it ain't broke, don't fix it.

N  intelligence, wisdom, intelligence, capacity, comprehension, understanding, cuteness, sabe, savvy, intellect, nous, parts, sagacity, mother wit, wit, esprit, gumption, quick parts, grasp of intellect, acuteness, acumen, subtlety, penetration, perspicacy, perspicacity, discernment, due sense of, good judgment, discrimination, cunning, refinement, head, brains, headpiece, upper story, long head, eagle eye, eagle- glance, eye of a lynx, eye of a hawk, wisdom, sapience, sense, good sense, common sense, horse sense, plain sense, rationality, reason, reasonableness, judgment, solidity, depth, profundity, caliber, enlarged views, reach of thought, compass of thought, enlargement of mind, genius, inspiration, geist, fire of genius, heaven-born genius, soul, talent, prudence, vigilance, tact, foresight, sobriety, self-possession, aplomb, ballast, a bright thought, not a bad idea, Solomon-like wisdom, intelligent, quick of apprehension, keen, acute, alive, brainy, awake, bright, quick, sharp, quick witted, keen witted, clear witted, sharp-eyed, sharp sighted, sharp witted, wide- awake, canny, shrewd, astute, clear-headed, farsighted, discerning, perspicacious, penetrating, piercing, argute, quick-witted, nimble-witted, needle-witted, sharp as a needle, sharp as a tack, alive to, clever, arch, pas si bete, acute, wise, sage, sapient, sagacious, reasonable, rational, sound, in one's right mind, sensible, abnormis sapiens, judicious, strong- minded, unprejudiced, unbiased, unbigoted, unprepossessed, undazzled, unperplexed, unwarped judgment, impartial, equitable, fair, cool, cool-headed, long-headed, hardheaded, strong-headed, long- sighted, calculating, thoughtful, reflecting, solid, deep, profound, oracular, heaven-directed, heaven-born, prudent, sober, stand, solid, considerate, politic, wise in one's generation, watchful, provident, in advance of one' age, wise as a serpent, wise as Solomon, wise as Solon, wise, sensible, reasonable, judicious, well- thought-out, well-planned, well-judged, well-advised, prudent, politic, expedient, aut regem aut fatuum nasci oportet, but with the morning cool reflection came, flosculi sententiarum, les affaires font les hommes, mas vale saber que haber, mas vale ser necio que profiadol nemo solus sapit, nosce te, gnothi seauton, nullum magnum ingenium sine mixtura dementiae fuit, sapere aude, victrix fortunae sapientia.