нееластичен означава в английски

inelastic▼(lacking elasticity)
adjective
[UK: ˌɪ.nɪ.ˈlæ.stɪk] [US: ˌɪ.nə.ˈlæ.stɪk]

stiff [stiffer, stiffest]▼(of an object, rigid, hard to bend, inflexible)
adjective
[UK: stɪf] [US: ˈstɪf]