资料来源 : pyDict

头重的,头重脚轻的,不定的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Top-heavy \Top"-heav`y\, a.
   Having the top or upper part too heavy for the lower part.
   --Sir H. Wotton.

资料来源 : WordNet®

top-heavy
     adj : unstable by being overloaded at the top