unstable

adj., -bler, -blest.

1. 1. Tending strongly to change: unstable weather.
   2. Not constant; fluctuating: unstable vital signs.
2. 1. Fickle.
   2. Lacking control of one's emotions; marked by unpredictable behavior.
3. Not firmly placed; unsteady: an unstable ladder.
4. Chemistry.
   1. Decomposing readily.
   2. Highly or violently reactive.
5. Physics.
   1. Decaying with relatively short lifetime. Used of subatomic particles.
   2. Radioactive.

unstableness un·sta'ble·ness n.
unstably un·sta'bly adv.

adjective

1. Capable of or liable to change: alterable, changeable, fluid, inconstant, mutable, uncertain, unsettled, unsteady, variable, variant. Archaic various. See change/persist.
2. Following no predictable pattern: capricious, changeable, erratic, fantastic, fantastical, fickle, freakish, inconsistent, inconstant, mercurial, temperamental, ticklish, uncertain, unpredictable, unsteady, variable, volatile, whimsical. See change/persist, continue/stop/pause.
3. Lacking stability: infirm, insecure, precarious, shaky, tottering, tottery, unsteady, unsure, weak, wobbly. See change/persist, strong/weak.
4. Not physically steady or firm: precarious, rickety, shaky, tottering, tottery, unsteady, wobbly. See flexible/rigid.

adj

1. not firm or fixed in one place; likely to move. 2. capable of undergoing spontaneous change. A nuclide in an unstable state is called radioactive. An atom in an unstable state is called excited.

Having a tendency to disrupt, e.g. unstable chemicals.

• u. fracture — the principal fragments in a reduced fracture are overriding. Slow union or nonunion results.

Dansk (Danish)
adj. - ustabil, vaklende, usikker, skiftende, uregelmæssig, ujævn, uligevægtig, ustadig

idioms:

• unstable equilibrium    ustadig ligevægt

Nederlands (Dutch)
onstabiel, onvast, labiel, radioactief

Français (French)
adj. - instable

idioms:

• unstable equilibrium    équilibre instable

Deutsch (German)
adj. - instabil, nicht stabil, labil

idioms:

• unstable equilibrium    labiles Gleichgewicht

Ελληνική (Greek)
adj. - ασταθής, άστατος

idioms:

• unstable equilibrium    ασταθής ισορροπία

Italiano (Italian)
instabile

idioms:

• unstable equilibrium    equilibrio instabile

Português (Portuguese)
adj. - instável, variável, indeciso

idioms:

• unstable equilibrium    equilíbrio instável

Русский (Russian)
нестабильный, нетвердый (о человеке), неуравновешенный (о человеке)

idioms:

• unstable equilibrium    неустойчивое равновесие

Español (Spanish)
adj. - inestable, fluctuante, vacilante

idioms:

• unstable equilibrium    equilibrio inestable

Svenska (Swedish)
adj. - instabil, ostadig, osäker, vacklande, ombytlig, oberäknelig

中文（简体）(Chinese (Simplified))
不牢固的, 不稳定的

idioms:

• unstable equilibrium    不稳定平衡

中文（繁體）(Chinese (Traditional))
adj. - 不牢固的, 不穩定的

idioms:

• unstable equilibrium    不穩定平衡

한국어 (Korean)
adj. - 불안정한, 변하기 쉬운

日本語 (Japanese)
adj. - 不安定な, 変わりやすい, 落ち着きがない

idioms:

• unstable equilibrium    不安定平衡

العربيه (Arabic)
‏(صفه) متقلب, متزعزع, غير مستقر‏

עברית (Hebrew)
adj. - ‮לא יציב, רעוע, מתחלף, בעל נטיות לשינויים נפשיים ורגשיים‬

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