Unrecognizable (adjective)

1. Not able to be recognized; not familiar.
2. Not able to be identified.

Origin:

Mid 19th century: from un- (expressing negation) + recognizable.

Examples:

1. The building was unrecognizable.
2. The person was unrecognizable.
3. The face was unrecognizable.
4. The changed city was unrecognizable.
5. The product was unrecognizable.