unstable
adjective
[ ʌnˈsteɪb(ə)l ]
• likely to give way; not stable.
• "the unstable cliff tops"
Similar:
unsteady,
rocky,
wobbly,
wobbling,
rickety,
shaky,
tottery,
tottering,
teetering,
doddery,
unsafe,
unbalanced,
unreliable,
insecure,
not secure,
unfastened,
unsecured,
movable,
precarious,
bockety,