Subject to breaking into sharp slender pieces.

Roget 328: brittle, brash [U.S.], breakable, weak, frangible, fragile, frail, gimcrack^†, shivery, fissile; splitting etc. v.; lacerable^†, splintery, crisp, crimp, short, brittle as glass.    ... show more

Resembling or consisting of or embedded with long slender fragments of (especially) wood having sharp points:
— A rough splintery floor of old pine boards.

synonym: slivery.