unofficial

Fact check: The DMV will never ask for personal information or payment through unofficial channels such as social media sites and transaction applications.

It’s not just his burly 6-foot-4 frame, his clean-shaven head or the boldly patterned, brightly colored Hawaiian shirts he’s adopted as an unofficial uniform.

He was relatively unknown nationally before he was selected by opposition party PiS to be their "unofficial" candidate.

Describing each other as “good friends,” the two men dress similarly in unofficial uniforms of black T-shirts and black pants, and they’re so in sync they sometimes finish each other’s thoughts.

It is considered one of motorsport's triple crown events - an unofficial achievement - along with the Indianapolis 500 and Le Mans.