Adjective: semirigid ,se-mee'ri-jid
- Not fully rigid
"The semirigid plastic container was both durable and slightly flexible"
- (aeronautics) having a form maintained by a rigid internal structure as well as by internal gas pressure
"The semirigid airship combined the stability of a frame with the buoyancy of gas"
See also: inflexible, rigid, unbendable