There are multiple definitions - click on the translation that matches your context.

unlautere Werbung

Substantiv

partial

deceptive advertising

noun

Comparative law notes

Germany

To the extent "unlautere" advertisements also include misleading ("irreführend") ads, other common synonyms used for the English phrase are "unfair advertising" or "false advertising"

Definitions of deceptive advertising

English

promotion of goods or services which is dishonest and misleading

The company is far from the only business that has been investigated by the Federal Trade Commission for deceptive advertising.