semirigid

adjectives

having a form maintained by a rigid internal structure as well as by internal gas pressure
semirigid
is similar to
designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
rigid
domain category
the theory and practice of navigation through air or space
aeronautics, astronautics
not fully rigid
semirigid
is similar to
resistant to being bent
"an inflexible iron bar"; "an inflexible knife blade";
inflexible