UNBREAKABLE in a Sentence

Learn UNBREAKABLE from example sentences, some of them are from classic books. These examples are selected from a corpus with 300,000 sentences, including classic works and current mainstream media. Some sentences also link to their contexts.

For UNBREAKABLE, below is one of 4 sentences:
One unbreakable rule in our school is that no child can be tested without written parental permission.

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 Meanings and Examples of UNBREAKABLE
Definition Example Sentence Classic Sentence
unbreakable
 a.  impossible to break especially under ordinary usage
Classic Sentence:
1  He was a patentee of the Openshaw unbreakable tire, and his business met with such success that he was able to sell it and to retire upon a handsome competence.
The Adventures of Sherlock Holmes By Arthur Conan Doyle
Context  Highlight   In V. THE FIVE ORANGE PIPS
Example Sentence:
1  This unbreakable bond that unites as one,Is as strong as the ascent of the morning sun.
2  This new material is virtually unbreakable.
3  One unbreakable rule in our school is that no child can be tested without written parental permission.