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

Antonym: rigid

• unblushingly
• unbodied
• unbolt
• unbolted
• unbooked
• unbordered
• unborn
• unbosom
• unbound
• unbounded
• unbounded interval
• unboundedness
• unbowed
• unbox
• unbrace
• unbraced
• unbraid
• unbrainwashed
• unbranched
• unbranching
• unbranded
• unbreakable
• unbreakableness
• unbridgeable
• unbridle