an unknown quantity in a sentence

Examples

1. Like Irabu, he was something of an unknown quantity _ just from a different country.
2. And the Croatian team is an unknown quantity that has already surprised many by beating Germany.
3. To most people, Koehler is an unknown quantity.
4. In 2007, the Raiders were an unknown quantity.
5. I wondered why they put him on in mornings, since he was an unknown quantity here.
6. Schwartz shouldn't have been such an unknown quantity.
7. He is an unknown quantity in Sierra Leone.
8. The IRA also disposed of an unknown quantity of weapons on October 2001 and April 2002.
9. But O'Neal is an unknown quantity right now.
10. The Irish Republican Army put an unknown quantity of its guns and explosives " beyond use"