semiflexible

adjective

semi·​flex·​i·​ble ˌse-mē-ˈflek-sə-bəl 

ˌse-ˌmī-,

-mi-

1

: somewhat flexible

2

of a book cover : having a thin board stiffener under the covering material

Word History

First Known Use

1925, in the meaning defined at sense 1