1. (n.) The quality or condition of being unstable; want of stability, firmness, or steadiness; liability to give way or to fail; insecurity; precariousness; as, the instability of a building.
2. (n.) Lack of determination of fixedness; inconstancy; fickleness; mutability; changeableness; as, instability of character, temper, custom, etc.
Thesaurus Entries
ambitendency, ambivalence, caducity, capriciousness, chanciness, change of mind, changeability, changeableness, choppiness, corruptibility, criticalness, danger, dappleness, death, decrepitude, delicacy, desultoriness, deviability, deviation, difference, differentiation, disorder, divarication, divergence, diversification, double-mindedness, doubtfulness, dubiety, dubiousness, eccentricity, ephemerality, ephemeralness, erraticism, evanescence, fence-sitting, fence-straddling, fickleness, finitude, fleetingness, flightiness, freakishness, fugacity, hazard, hazardousness, impermanence, impermanency, impulsiveness, incapacity, inconsistency, inconstancy, indecision, indecisiveness, inequality, infirmity, infirmity of purpose, insecurity, insipidity, insolidity, insubstantiality, invalidism, irregularity, irresolution, jerkiness, mercuriality, momentariness, moodiness, mortality, motleyness, mugwumpery, mugwumpism, mutability, nonconformism, nonconformity, nonstandardization, nonuniformity, peril, perilousness, perishability, pluralism, precariousness, raggedness, restlessness, ricketiness, risk, riskiness, second thoughts, senility, shakiness, shiftiness, shiftingness, slipperiness, speculativeness, sword of Damocles, tergiversation, ticklish business, ticklishness, totteriness, touchiness, transience, transiency, transientness, transitoriness, treacherousness, treachery, unauthenticity, unauthoritativeness, uncertainty, unconformism, unconformity, undecidedness, undependability, undeterminedness, unevenness, unfaithworthiness, unfirmness, unfixedness, unhealthiness, unorthodoxy, unpredictability, unreliability, unsafeness, unsettledness, unsettlement, unsolidity, unsoundness, unstableness, unsteadfastness, unsteadiness, unsturdiness, unsubstantiality, unsureness, untrustworthiness, vapidity, variability, variation, variegation, variety, variousness, versatility, volatility, wantonness, wateriness, wavering, waywardness, whimsicality, wishy-washiness
