In unstable equilibrium, easily upset or overthrown, insecure, tottering, crazy; also, easily set in motion or action; nicely poised; delicate…

Not stable; lacking stability; unstable.

Not properly balanced.

Not balanced or equably poised. Of material things.

(un-, prefix1 affix 2.)

Heavier or larger at the bottom than the top. Also: having a disproportionate amount of material towards the bottom. Cf. top-heavy, adj. 1a.

Mechanics. Of equilibrium.

In form out-of-balance. That is not balanced.

Uneven, unbalanced, distorted; (also) unconventional, offbeat, eccentric.