unstable (adj.)

• adrift
• afloat
• alternating
• ambiguous
• amorphous
• borderline
• brittle
• buoyant
• canted
• capricious
• changeable
• changeful
• changing
• choppy
• corruptible
• dangerous
• deciduous
• decrepit
• desultory
• deviating
• dickey
• different
• disorderly
• divergent
• diversified
• dizzy
• doubtful
• dubious
• dying
• eccentric
• effervescent
• elastic
• ephemeral
• erose
• erratic
• evanescent
• fading
• fickle
• fitful
• fleeting
• flickering
• flighty
• fluctuating
• fluid
• fly-by-night
• flying
• fragile
• frail
• freakish
• fugacious
• fugitive
• giddy
• hazardous
• heeling
• impermanent
• impetuous
• impulsive
• inconsistent
• inconstant
• indecisive
• indefinite
• infirm
• insecure
• insubstantial
• irregular
• irresolute
• irresponsible
• jagged
• jerky
• leaning
• lopsided
• lubricious
• mazy
• mercurial
• mobile
• momentary
• moody
• mortal
• motley
• moving
• mutable
• nonconformist
• nonstandard
• nonuniform
• passing
• perilous
• perishable
• pluralistic
• poor
• precarious
• protean
• provisional
• ragged
• rambling
• resilient
• restless
• risky
• rocky
• rootless
• rotten
• rough
• roving
• scatterbrained
• shaky
• shapeless
• short-lived
• slippery
• spasmodic
• spineless
• sporadic
• suspect
• temperamental
• temporal
• temporary
• tentative
• ticklish
• top-heavy
• tottery
• transient
• transitive
• transitory
• treacherous
• tricky
• unaccountable
• unbalanced
• uncertain
• uncontrolled
• undecided
• undependable
• undisciplined
• unequal
• uneven
• unfirm
• unfixed
• unhealthy
• unorthodox
• unpredictable
• unreliable
• unrestrained
• unsafe
• unsettled
• unsound
• unsteady
• unsubstantial
• unsure
• unsystematic
• untrustworthy
• vacillating
• vagrant
• variable
• variegated
• variform
• various
• varying
• volatile
• wandering
• wanton
• wavering
• wavy
• wayward
• weak
• whimsical
• wishy-washy
• wobbly