Synonyms of interventionist
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interferingIf you describe someone as interfering, you are criticizing them because they try to get involved in other people's affairs or to give them advice, especially when the advice is not wanted.
• She regarded her mother as an interfering busybody.
• Her bodyguards were less than gentle with intrusive journalists.
meddlesomeIf you describe a person as meddlesome, you are criticizing them because they try to influence or change things that do not concern them.
• a meddlesome member of the public
Thesaurus for interventionist from the Collins English Thesaurus
of, relating to, or advocating intervention, esp in the affairs of a foreign country