This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Tending strongly to change: unstable weather.

adj. Not constant; fluctuating: unstable vital signs.

adj. Fickle.

adj. Lacking control of one's emotions; marked by unpredictable behavior.

adj. Not firmly placed; unsteady: an unstable ladder.

adj. Chemistry Decomposing readily.

adj. Chemistry Highly or violently reactive.

adj. Physics Decaying with relatively short lifetime. Used of subatomic particles.

adj. Physics Radioactive.

adj. having a strong tendency to change

adj. fluctuating; not constant

adj. fickle

adj. unpredictable

adj. Readily decompasable

adj. Radioactive, especially with a short half-life

adj. Not stable; not firm, fixed, or constant; subject to change or overthrow.

To make no longer a stable or filthy abode.

Not stable; not fixed.

Not steady; inconstant; irresolute; wavering.

adj. subject to change; variable

adj. disposed to psychological variability

adj. highly or violently reactive

adj. lacking stability or fixity or firmness

adj. affording no ease or reassurance

adj. suffering from severe mental illness

"On the other hand, the term unstable does not necessarily mean that there are problems - rather, that enhancements or changes have been made to the software that have not undergone rigorous testing and that more changes are expected to be imminent."

changeful    changeable    irresolute    reactive    volatile    coseismal    tipsy    rocky    explosive    volcanic   

constant    stable   

unstable equilibrium   

instability    unstability   

changeable    inconstant    infirm    instable    variable    fluctuant    wavering    fluid    labile    crank   

Abel    Cable    Gable    Mabel    Mable    Sable    able    cable    chaebol    disable   

volatile    unpredictable    uncertain    unreliable    precarious    fragile    insecure    vulnerable    fickle    sensitive