A person who takes a firm, uncompromising position on some policy.(noun)
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Use "hard-liner" in a sentence
"Mr. Bayik is known as a hard-liner in the organization and a supporter of old-style revolutionary Marxist, the initial ideology of the PKK."
"Amidror is known as a hard-liner who opposed Israel's withdrawal from Gaza in 2005."
"Mr. Lieberman, known as a hard-liner toward the Palestinians, could face charges of money laundering, fraud and breach of trust in connection with private business dealings during his tenure as a member of parliament and a cabinet minister, according to Israel's Justice Ministry."