1.  insecurity(n = noun.state) - the state of being subject to danger or injury;
is a kind of danger
has particulars: insecureness
Antonym: security
Derived forms adjective insecure₂, adjective insecure₄

2.  insecurity(n = noun.feeling) - the anxiety you experience when you feel vulnerable and insecure;
is a kind of anxiety
Derived form adjective insecure₃

1.  The condition or quality of being insecure; lack of safety; danger; hazard; as, the insecurity of a building liable to fire; insecurity of a debt. [1913 Webster]

2.  The state of feeling insecure; uncertainty; lack of confidence. [1913 Webster]
"With what insecurity of truth we ascribe effects . . . unto arbitrary calculations." [1913 Webster]
"A time of insecurity, when interests of all sorts become objects of speculation." [1913 Webster]

N  danger, peril, insecurity, jeopardy, risk, hazard, venture, precariousness, slipperiness, instability, defenselessness, exposure, vulnerability, vulnerable point, heel of Achilles, forlorn hope, leap in the dark, road to ruin, faciles descensus Averni, hairbreadth escape, cause for alarm, source of danger, rock ahead, breakers ahead, storm brewing, clouds in the horizon, clouds gathering, warning, alarm, apprehension, in danger, endangered, fraught with danger, dangerous, hazardous, perilous, parlous, periculous, unsafe, unprotected &c (safe, protect), insecure, untrustworthy, built upon, sand, on a sandy basis, wildcat, defenseless, fenceless, guardless, harborless, unshielded, vulnerable, expugnable, exposed, open to, aux abois, at bay, on the wrong side of the wall, on a lee shore, on the rocks, at stake, in question, precarious, critical, ticklish, slippery, slippy, hanging by a thread, with a halter round one's neck, between the hammer and the anvil, between Scylla and Charybdis, between a rock and a hard place, between the devil and the deep blue sea, between two fires, on the edge of a precipice, on the brink of a precipice, on the verge of a precipice, on the edge of a volcano, in the lion's den, on slippery ground, under fire, not out of the wood, unwarned, unadmonished, unadvised, unprepared, off one's guard, tottering, unstable, unsteady, shaky, top-heavy, tumbledown, ramshackle, crumbling, waterlogged, helpless, guideless, in a bad way, reduced to the last extremity, at the last extremity, trembling in the balance, nodding to its fall, threatening, ominous, illomened, alarming, explosive, adventurous, incidit in Scyllam qui vult vitare Charybdim, nam tua res agitur paries dum proximus ardet.