adj., -i·er, -i·est.

1. Not firm, solid, or securely in place; unstable.
2. Fluctuating; changeable: an unsteady market.
3. Not even or regular; wavering: an unsteady voice.

tr.v., -ied, -y·ing, -ies.

To cause to become unsteady.

unsteadily un·stead'i·ly adv.
unsteadiness un·stead'i·ness n.

adjective

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

Note: click on a word meaning below to see its connections and related words.

The adjective has 3 meanings:

Meaning #1: subject to change or variation especially in behavior
  Antonym: steady (meaning #1)

Meaning #2: not having a steady rhythm
  Synonyms: arrhythmic, jerking, jerky

Meaning #3: not firmly or solidly positioned
  Synonym: unfirm

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Dansk (Danish)
adj. - usikker, ikke fast, vakkelvorn, vaklende, uregelmæssig
v. tr. - usikker

Nederlands (Dutch)
wankel, onvast, niet stevig, veranderlijk, onregelmatig, aan het wankelen brengen, veranderlijk/ onregelmatig maken

Français (French)
adj. - chancelant, instable, tremblant, irrégulier (un rythme)
v. tr. - rendre instable

Deutsch (German)
adj. - unsicher, instabil, unregelmäßig, ungleichmäßig
v. - unsicher machen

Ελληνική (Greek)
adj. - ασταθής, μη σταθεροποιημένος

Italiano (Italian)
malfermo, irregolare

Português (Portuguese)
adj. - instável, irresoluto, libertino

Русский (Russian)
нетвердый, шаткий, непостоянный

Español (Spanish)
adj. - inestable, inseguro, irregular
v. tr. - inestabilizar

Svenska (Swedish)
adj. - ostadig, vacklande, ombytlig, flackande, oberäknelig, göra ostadig, rubba

中文（简体） (Chinese (Simplified))
不安定的, 反覆无常的, 使不稳定, 动摇

中文（繁體） (Chinese (Traditional))
adj. - 不安定的, 反覆無常的
v. tr. - 使不穩定, 動搖

한국어 (Korean)
adj. - 불안정한, 변하기 쉬운, 행실이 나쁜
v. tr. - 불안정하게 하다

日本語 (Japanese)
adj. - ぐらぐらする, 不安定な, ふらつく, 変わりやすい, むらのある

العربيه (Arabic)
‏(صفه) مضطرب, مزعزع, متقلب, مقلقل‏

עברית (Hebrew)
adj. - ‮לא יציב, לא תמידי, משתנה, מתנודד, לא אחיד‬
v. tr. - ‮ערער יציבות‬

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