Synonyms of 'hardliner'
Unionist hardliners warned the President he would not be welcome.
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If you describe someone as an extremist, you disapprove of them because they try to bring about political change by using violent or extreme methods.
Police believe the bombing was the work of left-wing extremists.
If you describe someone as a fanatic, you disapprove of them because you consider their behaviour or opinions to be very extreme, for example in the way they support particular religious or political ideas.
I am not a religious fanatic but I am a Christian.
Thesaurus for hardliner from the Collins English Thesaurus
The hardliners in a group such as a political party are the people who support a strict , fixed set of ideas that are often extreme , and who refuse to accept any change in them.