Opposed to a government currently in power(adjective)
Opposed to government in general(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "antigovernment" in a sentence
"They pointed to an upsurge in antigovernment guerrilla activity inside Iran, including a bomb in Zahedan, the economic center of the province of Baluchistan, that killed 11 soldiers in the elite Islamic Revolutionary Guard Corps on February 14; the mysterious death of the Iranian scientist Ardashir Hosseinpour, who worked on uranium enrichment at the Isfahan nuclear facility; and the defection of a high-ranking Iranian general named Ali Asgari, a former deputy minister of defense who was also the Revolutionary Guard officer responsible for training and supplying Hezbollah during its war against the Israelis in southern Lebanon in the 1980s."
"During the day, state television aired patriotic songs and religious sermons that referred to antigovernment protesters and army rebels as "traitors" and "collaborators with the West and the Jews.""
"Prime Minister Emil Boc fired Foreign Minister Teodor Baconschi on Monday for calling antigovernment protesters "inept and violent slum-dwellers" after more than a week of sometimes violent demonstrations."