Inextensible

(a.) Not capable of being extended; as, inextensible antenna.

Thesaurus Entries

adamant, adamantine, immovable, immutable, inductile, inelastic, inextensile, inextensional, inflexible, intractable, intractile, irresilient, nonelastic, nonstretchable, stubborn, unalterable, unbending, unextendible, unextensible, unflexible, ungiving, unlimber, unmalleable, unpliable, unpliant, untractable, unyielding