noncollapsible

from WordNet (r) 3.0 (2006)

noncollapsible
    adj 1: not capable of collapsing [syn: {noncollapsible},
           {noncollapsable}] [ant: {collapsable}, {collapsible}]

from The Collaborative International Dictionary of English v.0.48

noncollapsable \noncollapsable\ noncollapsible
\noncollapsible\adj.
   1. not able to be folded into a compact form. Opposite of
      {collapsible}. [Narrower terms: {nontelescopic,
      nontelescoping}]
      [WordNet 1.5]