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unsparing
unspeakable
unspecialized
unspoiled
unspoken
unsportsmanlike
unspotted
unsprung
unstable
unstable equilibrium
unsteady
unsteel
unstep
unstick
unstinting
unstop
unstoppable
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unstable

un·sta·ble [ un stáyb'l ]


adjective 
Definition:
 
1. not fixed: not firm, solid, or fixed
unstable ground

2. likely to fall or collapse: likely to fall, collapse, or sway
unstable scaffolding

3. lacking emotional or psychological stability: lacking, or resulting from a lack of, emotional control or psychological stability
unstable behavior

4. changeable: apt to change
unstable weather

5. unsteady in purpose or intent: unsteady or unsure in purpose or intent
political support that is unstable

6. physics having short half-life: having a brief existence or half-life

7. physics subject to spontaneous change: describes a particle that is subject to spontaneous change such as radioactive decay


un·sta·ble·ness noun
un·sta·bly adverb
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