Un-american (adjective)

1. Not in accordance with or characteristic of the principles and values of the United States of America.
2. Opposed to the interests or values of the United States of America.

Origin:

From un- + american, first recorded in the early 20th century.

Examples:

1. He was accused of being un-American for his criticism of the government.
2. The group was labeled as un-American for their opposition to the war.
3. The law was considered un-American by civil rights activists.
4. The group's activities were seen as un-American by the government.
5. The book was banned for its un-American content.