The Collaborative International Dictionary of English v.0.48:

Frangible \Fran"gi*ble\, a. [Cf. F. frangible.]
   Capable of being broken; brittle; fragile; easily broken.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frangible
    adj 1: capable of being broken; "the museum stored all frangible
           articles in locked showcases"

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "frangible":
   breakable, brittle, brittle as glass, cheap-jack, cobwebby,
   crackable, crisp, crispy, crumbly, crushable, dainty, delicate,
   delicately weak, effeminate, fissile, flimsy, fracturable, fragile,
   frail, friable, gimcrack, gimcracky, gossamery, jerry, jerry-built,
   lacerable, light, lightweight, namby-pamby, papery, pasteboardy,
   puny, scissile, shatterable, shattery, shivery, sissified, sleazy,
   slight, splintery, tacky, unsubstantial, vulnerable, wispy,
   womanish