It might mean not realor fake. It might mean "off the record", not for public consumption. It might mean amateur, done by someone simply out of a love of the subject. It might mean preliminary, subject to later "official" correction.
But in all cases it means without approval of the authorities.
unofficial
Yes, it is. It is the opposite of the word formal (not formal), and a synonym of casual or unofficial.
deceeded (unofficial) ((OK, I am the only one who uses this... it is not my fault, there is no good translation for the German unterschreiten...))
The unofficial US celebration day (October 16) is spelled '''Boss's Day''', but alternately as Bosses Day.
Perhaps because sloths are solitary creatures, they don't form groups. But they must mate and nurture their young, a pair of sloths will work. However there have been many different unofficial phrases to describe a group of sloths, such as: "A bed of sloths" or "A slumber of sloths."
It is the unofficial color of Mexico
when diplomacy becomes strangely unofficial......strangely.......STRANGELY UNOFFICIAL!
the Eupatagus
This is just an unofficial estimate.
Commencement - unofficial - was created in 1999.
There really is not much of a difference between unofficial and non-official. They both mean non confirmed and non formal.
The results would be unofficial until they were validated by the judges. It was an unofficial copy of the book, a clear violation of copyright.
warrior princess, also beautiful.
Answers given on Answers.com are usually unofficial.
when diplomacy becomes strangely unofficial......strangely.......STRANGELY UNOFFICIAL!
Santana Unofficial Album was created in 1990.
Eve Zibart has written: 'The Unofficial Guide to Branson, Missouri (Frommer's Unofficial Guides)' 'The Unofficial Guide to Washington, D.C. 1997 (Issn 1071-6440)' 'The Unofficial Guide to Washington, D.C. 1996 (Issn 1071-6440)' 'The eclectic gourmet guide to Washington, D.C' -- subject(s): Guidebooks, Restaurants 'The Unofficial Guide to Branson, Missouri (Unofficial Guide to Branson, Missouri, 2nd ed)' 'The Unofficial Guide to New Orleans' 'This Day in Disney History (This Day in History)' 'The Unofficial Guide to Walt Disney World for Grown-Ups (Unofficial Guides)' 'The Unofficial Guide to New Orleans (Unofficial Guide to New Orleans, 2nd ed)' 'The Unofficial Guide to New York City (Unofficial Guide to New York City, 2nd)' 'The Unofficial Guide to New York City (Unofficial Guides)' 'The Unofficial Guide to Walt Disney World for Grown-Ups' 'The Unofficial Guide(r) to Washington, D.C.'