un·break·able 
/ˌʌnˈbreɪkəbəl/ adjective
/ˌʌnˈbreɪkəbəl/ adjective : not able to be broken : not breakable
▪ The two of them had an unbreakable bond of friendship. ▪ The plastic is virtually unbreakable.
▪ The two of them had an unbreakable bond of friendship. ▪ The plastic is virtually unbreakable.
