1.  indiscretion(n = noun.attribute) injudiciousness - the trait of being injudicious;
is a kind of folly, foolishness, unwiseness

2.  indiscretion(n = noun.act) peccadillo - a petty misdeed;
is a kind of misbehavior, misbehaviour, misdeed

1.  The quality or state of being indiscreet; lack of discretion; imprudence. [1913 Webster]

2.  An indiscreet act; indiscreet behavior. [1913 Webster]
"Past indiscretion is a venial crime." [1913 Webster]

indiscretion, n.
1 lack of discretion; indiscreet conduct.
2 an indiscreet action, remark, etc.

Etymology:
ME f. OF indiscretion or LL indiscretio (as IN-(1), DISCRETION)

N  rashness, temerity, want of caution, imprudence, indiscretion, overconfidence, presumption, audacity, precipitancy, precipitation, impetuosity, levity, foolhardihood, foolhardiness, heedlessness, thoughtlessness, carelessness, desperation, Quixotism, knight-errantry, fire eating, gaming, gambling, blind bargain, leap in the dark, leap of faith, fool's paradise, too many eggs in one basket, desperado, rashling, madcap, daredevil, Hotspur, fire eater, bully, bravo, Hector, scapegrace, enfant perdu, Don Quixote, knight-errant, Icarus, adventurer, gambler, gamester, dynamitard, boomer, rash, incautious, indiscreet, imprudent, improvident, temerarious, uncalculating, heedless, careless, without ballast, heels over head, head over heels, giddy, wanton, reckless, wild, madcap, desperate, devil-may-care, hot-blooded, hotheaded, hotbrained, headlong, headstrong, breakneck, foolhardy, harebrained, precipitate, impulsive, overconfident, overweening, venturesome, venturous, adventurous, Quixotic, fire eating, cavalier, janty, jaunty, free and easy, off one's guard, post haste, a corps perdu, hand over head, tete baissee, headforemost, happen what may, come what may, neck or nothing, the devil being in one, non semper temeritas est felix, paucis temeritas est bono multis malo.

N  guilt, guiltiness, culpability, criminality, criminousness, deviation from rectitude, sinfulness, misconduct, misbehavior, misdoing, misdeed, malpractice, fault, sin, error, transgression, dereliction, delinquency, indiscretion, lapse, slip, trip, faux pas, peccadillo, flaw, blot, omission, failing, failure, break, bad break!, capital crime, delictum, offense, trespass, misdemeanor, misfeasance, misprision, malefaction, malfeasance, malversation, crime, felony, enormity, atrocity, outrage, deadly sin, mortal sin, deed without a name, corpus delicti, guilty, to blame, culpable, peccable, in fault, at fault, censurable, reprehensible, blameworthy, uncommendable, illaudable, weighed in the balance and found wanting, exceptionable, in flagrante delicto, red-handed, in the very act, with one's hand in the cookie jar, cui prodest scelus in fecit, culpam paena premit comes, O would the deed were good!, responsibility prevents crimes se judice nemo noce, so many laws argues so many sins.