Antonyms of adj friable

1 sense of friable

Sense 1
crumbly, friable -- (easily broken into small fragments or reduced to powder; "friable sandstone"; "friable carcinomatous tissue"; "friable curds formed in the stomach";"crumbly cookies")

INDIRECT (VIA breakable) -> unbreakable -- (impossible to break especially under ordinary usage; "unbreakable plastic dinnerwear")

Similarity of adj friable

1 sense of friable

Sense 1
crumbly, friable -- (easily broken into small fragments or reduced to powder; "friable sandstone"; "friable carcinomatous tissue"; "friable curds formed in the stomach";"crumbly cookies")
       => breakable (vs. unbreakable) -- (capable of being broken or damaged; "earthenware pottery is breakable"; "breakable articles should be packed carefully")