How to Use "unbeknown" with Example Sentences

1. He went there unbeknown to me .
2. His past is ancient and unbeknown just like his true power .
3. Unbeknown to most who pass through this serene place , however , it is a gold mine for medical research .
4. But as megan exercised more and , unbeknown to her parents , ate less , her weight began to plummet .
5. A crisis unbeknown to me ; she had been ill for months , unbeknownst to the family .