unofficial

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. not having official authority or sanction (Freq. 3)
- a sort of unofficial mayor
- an unofficial estimate
- he participated in an unofficial capacity
• Ant:
official
• Similar to:
drumhead, summary, informal, loose, unauthorized,
unauthorised, wildcat, unsanctioned
• See Also:
unauthorized, unauthorised
2. not officially established
- the early election returns are unofficial
• Similar to:
unconfirmed