nonrigid

形容词 nonrigid:

1. designating an airship having a shape maintained only by internal gas pressure and without a supporting structure

non.rig.id

adj.（形容词）
Not rigid:
非刚性的：
例句：
a nonrigid frame.
一个非刚性的框架

Of, relating to, or being a lighter-than-air aircraft that holds its shape by gas pressure.
软式飞艇的：属于、关于或是由气体压力支撑其形状的轻型飞艇的