Definition of unbreakable adjective from the Oxford Advanced Learner's Dictionary

 

unbreakable

 adjective
adjective
BrE BrE//ʌnˈbreɪkəbl//
 
; NAmE NAmE//ʌnˈbreɪkəbl//
 
 
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impossible to break synonym indestructible This new material is virtually unbreakable. the unbreakable bond between parent and child opposite breakable
See the Oxford Advanced American Dictionary entry: unbreakable