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fragile implies such delicacy of structure as to be easily broken a fragile china teacup; frangible connotes a liability to being broken because of the use to which the thing is put the bridge was constructed with frangible stone; brittle implies such inelasticity as to be easily broken or shattered by pressure or a blow the bones of the body become brittle with age; crisp suggests a desirable sort of brittleness, as of fresh celery or crackers; friable is applied to something that is easily crumbled or crushed into powder friable rock
See fragile in American Heritage Dictionary 4 Synonyms
See fragile in Webster's New World Roget's A-Z Thesaurus II
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